PER CURIAM.
ORDER
It is ORDERED,
sua sponte,
that the opinion issued by the Court on May 10, 2007, and cited as
Appellants Walter A. Bolanos (“Bola-nos”), Luis M. Palacio (“Palacio”), and Edgar A. Cruz (“Cruz”) appeal from their convictions of aggravated assault while armed (“AAWA”), 3 assault with a dangerous weapon (“ADW”), 4 and carrying a dangerous weapon (“CDW”). 5 Appellants’ convictions stem from an altercation at school, during which Jose Mejia (“Mejia”), Omar Gonzalez (“Gonzalez”), and David Rodriguez (“Rodriguez”) were stabbed. Each appellant contends that there is insufficient evidence to support the “serious bodily injury” element of AAWA. Separately, Palacio contends that there was insufficient evidence to support his conviction for ADW. Appellants Bolanos and Pa-lacio contend that the trial court erred when it failed to dismiss the indictments for the AWIMWA counts. Cruz contends that the trial court erred by denying his pretrial motion to suppress out-of-court identifications by the victims and that his conviction should be reversed on grounds that his indictment was improperly amended. Finally, all appellants contend that if their convictions for AAWA are upheld, then their convictions for ADW merge into them as lesser-included offenses and that two convictions as to the same victim should also merge. We affirm in part, reverse in part, and remand in part.
I.
During the afternoon of April 14, 1998, victims Mejia, Gonzalez, Rodriguez, and three of their friends left Bell Multicultural School, where they attended high school. Although claiming not to be a gang, the group called themselves the Graffiti Kings because they liked to “tag” — ie., write their names — on the school’s walls. As *677 they crossed the school playground, they encountered a group of approximately fifteen young men, including appellants Bola-nos, Palacio, and Cruz. According to the three victims, the appellants were members of a rival group called the Little Brown Union. Allegedly, as the two groups crossed paths, Palacio confronted the Graffiti Kings regarding an earlier dispute. 6 A fight soon ensued between the two groups. At one point, a member of the Graffiti Kings shouted that someone from Little Brown Union had a knife. Almost immediately three members of the Graffiti Kings ran. Mejia, Gonzalez, and Rodriguez, however, could not get away and each was stabbed multiple times during the fight.
At trial, all three victims testified about the extent of their injuries. Their medical records, documenting their injuries, were stipulated. There was, however, no testimony, expert or otherwise, explaining the medical records or their contents.
Following trial, the jury convicted Bola-nos of: two counts of ADW as a lesser-included offense of both AWIMWA and AWIKWA, both as to the victim Mejia; one count of AAWA, as to Mejia; and, one count of CDW. Palacio’s convictions are: two counts of ADW as a lesser-included offense of both AWIMWA and AWIKWA, both as to the victim Rodriguez; one count of ADW as a lesser-included offense of AWIKWA, as to the victim Gonzalez; one count of AAWA, as to Rodriguez; and, one count of CDW. Cruz’s convictions are: two counts of ADW as a lesser-included offense of AWIKWA, as to Mejia and Gonzalez; two counts of AAWA, as to Mejia and Gonzalez; and, one count of CDW.
ll.
Sufficiency of the Evidence Claims with Respect to Appellants’ AAWA Convictions
All three appellants argue that there was insufficient evidence to permit a reasonable trier of fact to find that they inflicted “serious bodily injury,” an essential element of AAWA, on any of the victims in this case.
See e.g., Riddick v. United States,
This court defines serious bodily injury to encompass “bodily injury that involves a substantial risk of death, unconsciousness, extreme physical pain, protracted and obvious disfigurement, or protracted loss or impairment of the function of a bodily member, organ, or mental faculty.”
(Troy) Nixon v. United States,
In the present case, the trial was held before we issued our opinion in
Nixon,
and as a result the trial court failed to instruct the jury on two of the
Nixon
prongs-extreme pain and unconsciousness. Instead, the trial court defined serious bodily injury as an injury that causes substantial risk of death, serious permanent disfigurement, or protracted loss or impairment of the functions of a bodily member or organ. Because the trial court only instructed the jury on three of the five factors, the instruction was incorrect.
See Johnson v. United States,
This instructional error, however, does not result in
per se
reversal. If there was sufficient evidence to convict based upon the instruction given, then, necessarily, the verdict satisfies one of the
Nixon
elements of serious bodily injury. In addition, where this court finds instructional error but sufficient evidence in the record to support a conviction under the correct instruction, we will remand for further proceedings to allow the government, at its election, to re-try the appellant on the original charge.
Gathy v. United States,
Cruz’s AAWA Conviction for Assaulting Gonzalez
Gonzalez testified that Cruz stabbed him through his arm, that the knife then penetrated into his stomach, and that he underwent surgery. Gonzalez’s medical records state that to repair the perforation of his intestine, Gonzalez underwent surgery to suture the laceration. In addition, Gonzalez’s medical records state that after three days and upon discharge, Gonzalez was prescribed Percocet for pain and given a follow-up appointment at the trauma clinic. There was no expert testimony presented regarding the *679 effects of the knife wounds, or whether these types of wounds could be considered life-threatening. 8 The evidence in the record also fails to demonstrate if the wounds or incisions from the surgery physically scarred Gonzalez and the extent of the scarring, if any. Based on this record, we conclude that the evidence presented to the jury was insufficient to support a finding that Gonzalez faced a substantial risk of death, serious permanent disfigurement, or protracted loss or impairment of the functions of any bodily organ.
Nevertheless, the government, relying on this court’s holding in
Wilson v. United States,
Palacio’s AAWA Conviction for Assaulting Rodriguez
Rodriguez testified that Palacio stabbed him in his arm and cut his wrist, and that another unknown assailant stabbed him in his abdomen. Rodriguez’s medical records described the upper arm wound as “without complication” and the wrist wound as “superficial,” requiring only stitches. Rodriguez was also stabbed in the abdomen, but the medical records state that there were no life threatening or potentially disabling injuries identified from the abdomen wound. In addition, Rodriguez’s records state he was able to “ambulate[ ] independently.” After Rodriguez stayed in the hospital for less than eighteen hours, the hospital discharged him with a prescription for Percocet to be taken as needed for pain, and he was given a follow-up appointment at the trauma clinic. Finally, we note that the record
*680
was void of any evidence of the medical, consequential or lasting effects of the wounds inflicted on Rodriguez. Therefore, even viewing this evidence in a light most favorable to sustaining the jury’s verdict, we conclude that there is insufficient evidence from which a reasonable jury could find that Rodriguez faced a substantial risk of death, or suffered from either protracted and obvious disfigurement or protracted loss or impairment of the function of a bodily member as a result of the stabbing wound he received from Palacio.
Cf. (Troy) Nixon, supra,
Bolanos’ and Cruz’s AAWA Convictions for Assaulting Mejia
Turning now to Mejia’s injuries, Mejia testified that Bolanos and Cruz approached him, armed with knives, and that Bolanos stabbed him once in the chest and Cruz stabbed him once in the left shoulder. 9 After being stabbed, Mejia ran towards the school and, from there, was transported to the hospital. Mejia’s medical records state that he had an “uneventful transport” to the hospital with no loss of consciousness. Mejia testified that upon arrival at the hospital he was bleeding, his muscles hurt, and he had pain in his chest. Nevertheless, his medical records indicate that despite complaints of shortness of breath related to pain, Mejia arrived “alert, speaking and appropriately obeying commands.” Mejia remained in the hospital for two nights and three days and had “surgery” on the day of the incident. 10 Mejia’s wounds were characterized as small and round. The medical records also indicated that Mejia had a “small left apical pneumothorax” and a “left basilar atelectasis”; however, no medical testimony was provided to the jury about the meaning of those terms. Mejia was discharged after forty-eight hours. Upon discharge, the doctors gave Mejia a prescription for Percocet and instructed him not to lift anything greater than ten pounds.
Looking at the nature and extent of the injuries described in the record, and the high threshold of injury required for AAWA, a reasonable juror could not reasonably find that Mejia suffered a serious bodily injury under the
pre-Nixon
instruction given to the jury. The government argues that Mejia faced a substantial risk of death, as evidenced by his own statement that he believed he was going to die. That testimony alone, however, is not sufficient to support a conviction for AAWA. Unlike in
Zeledon,
where this court concluded that there was sufficient evidence in the record from which a reasonable juror could conclude that the victim suffered a serious bodily injury based on the medical testimony that the bleeding was severe enough to cause death,
Zeledon, supra,
In the same vein, we reject the government’s argument that Mejia suffered a “protracted and obvious disfigurement” in the form of scarring.
12
To be “protracted and obvious,” the scar must be “a serious permanent or physical disfigurement.”
(Troy) Nixon, supra,
Extreme Physical Pain
The extreme physical pain necessary to satisfy
Nixon
is a level of pain that “must be exceptionally severe if not unbearable.”
Swinton, supra,
Turning first to Rodriguez and Gonzalez, the record indicates that after being stabbed, Rodriguez walked to the
*682
nurse’s office with the assistance of a friend and that Gonzalez was also able to walk with the assistance of a security guard. Neither victim, however, testified as to how much pain, if any, he felt. Although at trial Detective Hewick testified that all the victims were in pain and that each was given Percocet for pain, this evidence is not enough to satisfy the showing of extreme pain that the statute requires. Therefore, we reverse both Cruz’s AAWA conviction for the assault on Gonzalez and Palacio’s AAWA conviction for the assault on Rodriguez. Upon remand the trial court shall vacate these convictions; however, the convictions for ADW, as lesser-included offenses, shall stand.
Gathy, supra,
On the other hand, a reasonable juror could find beyond a reasonable doubt that Mejia suffered extreme physical pain from the multiple stab wounds he received, sufficient to satisfy the threshold required for a conviction of AAWA. Specifically, Mejia testified that he told an officer that he was in pain and that he could not breathe. He also testified that his muscles hurt, his chest was in pain, and he kept thinking that he was going to die. In addition, Mejia’s medical records indicate that, upon his arrival at the hospital, Mejia complained of shortness of breath related to pain. To combat the pain, the hospital prescribed Mejia pain medication both during his hospital stay and upon discharge. Under these circumstances, a jury could reasonably infer that Mejia suffered “extreme physical pain.”
Nevertheless, because the trial judge failed to instruct on this part of the definition of serious bodily injury, we must reverse the AAWA convictions of Bolanos and Cruz for the assault of Mejia and remand to the trial court for further proceedings. Upon remand, the government shall have the option to retry Bolanos and Cruz on the AAWA charge because the evidence established sufficient evidence of extreme pain. If the government elects not to retry them, then Bolanos and Cruz shall stand convicted of ADW for the assault of Mejia. 14
III.
Palacio’s ADW Conviction for Assaulting Gonzalez
Palacio argues that the evidence was insufficient to support his conviction for ADW for assaulting Gonzalez because Gonzalez identified Cruz as his attacker. The government counters that while there is no direct evidence that Palacio stabbed Gonzalez, there was sufficient evidence presented to convict Palacio of ADW as an aider and abettor during the attack on Gonzalez.
15
To establish aiding and abetting, the government must prove that: (1) the offense was committed by someone; (2) the accused participated in the commission of the offense; and (3) he did so with guilty knowledge.
Hawthorne v. United States,
The question before this court is whether there was sufficient evidence to support the finding that Palacio participated as an
*683
aider and abettor in the assault on Gonzalez. It is well established that the government must present evidence from which a juror could reasonably conclude that the accused was not only present at the crime, but also that his conduct encouraged or facilitated the commission of the offense.
See Price v. United States,
Similarly, in this case, there was uncon-troverted evidence that Palacio was with Cruz-Gonzalez’s attacker — not only from the beginning of the fight, but throughout. In fact, each of the victims testified that Palacio was the one who initiated the confrontation by stepping forward from his group and telling the Graffiti Kings that if they have a problem with Little Brown Union then they should say something. Moreover, the evidence showed that Pala-cio was the first to draw his knife, thereby encouraging the other members of his group to do the same. Finally, the record is devoid of any evidence that Palacio effectively withdrew from the conflict prior to any assault taking place.
Settles v. United States,
IV.
Defective AWIMWA Indictments
Appellants Palacio and Bolanos argue that their indictments for AWIMWA were defective because there was no indication in the indictment that the grand jury considered whether there were any mitigating circumstances that would have excused their conduct. If the AWIMWA indictments were defective, then the trial court’s error in failing to dismiss the AWIMWA counts was severely prejudicial because neither appellant had attained the age of majority, and each would have been in the exclusive jurisdiction of the Family Division of the Superior Court, which affords far more protection and rehabilitation to juveniles than adults receive in the Criminal Division. D.C.Code § 16-2301.02 (2001). Accordingly, appellants argue that their ADW and AAWA convictions should *684 be reversed. For the reasons discussed below, we reject appellants’ argument.
In
Cain v. United States,
Nevertheless, appellants argue that this general rule is subject to the exception that “where a prosecutor is aware of substantial evidence negating a defendant’s guilt which might reasonably be expected to lead a grand jury not to indict, his failure to disclose such evidence to a grand jury may lead to a dismissal of the indictment.”
Id.
at 655. Appellants’ reliance on this court’s dictum in
Miles
is misplaced, especially in light of the Supreme Court’s subsequent holding in
United States v. Williams,
In addition, this court has favorably cited to the
Williams’
holding in several of our cases.
See Bruce v. United States,
617
*685
A.2d 986, 993 (D.C.1992) (“In general ... courts will not entertain the contention that the evidence before the grand jury was insufficient to indict.”);
Feaster v. United States,
V.
Out-of-court Identifications
Cruz next contends that the trial court erred by denying his pretrial motion to suppress his out-of-court identification by the victims. Cruz’s principal contention is that the photo array used in this case was impermissibly suggestive because based on the testimony of victims Mejia and Gonzalez, that is, they were shown only two to three photographs as opposed to the eleven photographs that the detective testified that he showed to both victims. Cruz also claims that the out-of-court identifications should be suppressed because even if the full photograph array was shown to Mejia and Gonzalez, his photograph differed from the others in the array because his photo’s background was more brightly lit, and his physical appearance in the photo differed from that of the other people in the array.
To prevail on a motion to suppress a pretrial identification, the appellant must establish that “the identification procedure was so impermissibly suggestive as to give rise to a very substantial likelihood of misidentification.”
Lyons v. United States,
While there was conflicting testimony presented about how many photographs were shown to Mejia and Gonzalez, with Detective Hewick testifying that he had shown one photo spread, comprised of eleven photographs to both Mejia and Gonzalez, and Gonzalez testifying that he remembered looking through only two to three photographs, the trial court credited the testimony of Detective Hewick when it denied Cruz’s motion to suppress. Cruz fails to offer any evidence to this court as to why the trial court’s credibility finding is plainly wrong; thus, we will not reverse the trial court’s credibility finding.
Hill, supra,
*686 Cruz also argues that the trial court erred because his photo differed from the other photos used in the spread in several respects. Our review of the record, however, does not support Cruz’s complaint. Each photograph in the array was of an individual with relatively short hair. All of the photos were of Hispanic males of similar age, with similar skin tone and eye color. Although three of the photos were darker due to the poor quality of the photograph or bad lighting, most of the photographs were similar in context to Cruz’s photograph and there was at least one photograph that was as light or lighter than Cruz’s photograph. Thus, the record fails to establish a level of suggestivity that would create a substantial likelihood of misidentification. „
Even assuming
arguendo
that the photo array was impermissibly suggestive, Cruz’s claim still fails because the trial court concluded that the identification was independently reliable, and we discern no basis to disturb that finding. In assessing the reliability of an eyewitness, the court must consider: (1) the opportunity for observation; (2) the length of observation; (3) the lighting conditions; (4) the lapse of time between identification and observation; (5) the factors affecting witness perception during observation; and (6) the witness’s confidence in the identification.
See Beatty v. United States,
VI.
Improper Amendment of Indictment
Cruz alleges that the trial court’s instruction on AAWA improperly amended the indictment; thus, violating his Fifth Amendment right to be tried only on charges returned by a grand jury. The argument is without merit. Under the statute, an individual commits AAWA if he either: (1) “knowingly or purposely causes serious bodily injury to another person”; or (2) “under circumstances manifesting extreme indifference to human life, ... knowingly engages in conduct which creates a grave risk of serious bodily injury to another person, and thereby causes serious bodily injury.” D.C.Code § 22-404.01 & -4502 (2001). Cruz’s indictment states that he “knowingly and purposefully cause[d] serious bodily injury” to the victims. However, the trial court’s jury instructions to the jury also included the second means of committing aggravated assault, that is, the defendant manifested extreme indifference to human life by knowingly engaging in conduct which created a grave risk of serious bodily injury.
Since Cruz did not object to the instruction at the trial level, we review for plain
*687
error. Super. Ct. R.Crim. P. SO (“No party may assign as error any portion of the charge or omission therefrom unless that party objects thereto before the jury retires to consider its verdict, stating distinctly the matter to which that party objects and the grounds of the objection.”);
see also Wilson-Bey v. United States,
VII.
Merger
Appellants make various merger arguments. The government concedes that if appellants’ AAWA convictions are upheld, then their convictions for ADW merge because ADW is a lesser-included offense of AAWA.
See Beaner v. United States,
The jury convicted Palacio of two counts of ADW, both for the assault of Rodriguez, and one count of AAWA, also for the assault of Rodriguez. The two counts of ADW merge into one, and upon remand the trial court shall vacate one ADW conviction. Because we reverse Palacio’s AAWA conviction for assaulting Rodriguez, the ADW conviction does not merge with any other conviction. Similarly, the jury convicted Bolanos of two counts of ADW, both for the assault of Mejia. These counts must also merge and upon remand the trial court shall vacate one ADW conviction. There are also no merger issues between the AAWA and ADW convictions because we reversed Bolanos’ AAWA conviction for the assault of Mejia. Finally, the jury convicted Cruz of two counts of ADW, one as to Gonzalez and one as to Mejia, and two counts of AAWA, also one as to Gonzalez and one as to Mejia. Because we reverse each of Cruz’s AAWA convictions, both the ADW convictions must stand.
Conclusion
To summarize, we reverse with instructions to the trial court to vacate Cruz’s AAWA conviction for assaulting Gonzalez and Palacio’s AAWA conviction for assaulting Rodriguez. We also reverse Cruz’s and Bolanos’ AAWA convictions for assaulting Mejia. Upon remand, if the government so elects then it may retry either Cruz or Bolanos, or both, on the original charge of AAWA for the assault of Mejia. Should the government elect to not re-try Cruz or Bolanos, their convictions for the lesser-included offense of ADW for the assault of Mejia shall stand. In all other respects, we affirm.
So ordered.
Notes
. In violation of D.C.Code §§ 22-504.1 & - 3202 (1981).
. All appellants were charged with assault with intent to kill while armed ("AWIKWA”), but the jury acquitted on those charges. D.C.Code §§ 22-501 and-3202 (1981). Additionally, Palacio and Bolanos were charged with assault with intent to murder while armed ("AWIMWA”). D.C.Code §§ 22-503, - 2403, and -3202 (1981). They were acquitted of AWIMWA. Instead, the jury convicted appellants of ADW as a lesser-included offense of both AWIKWA and AWIMWA.
. In violation of D.C.Code § 22-3204 (1981).
. Earlier that day Gonzalez, accompanied by Rodriguez and two other members of the Graffiti Kings, had a verbal encounter with Bolanos and other unnamed members of Little Brown Union. Gonzalez approached Bo-lanos and asked whether Bolanos tagged over the Graffiti Kings’ tags. The encounter ended when Gonzalez and his friends left, while the school security guard was approaching the group.
. We take this moment to explicitly join our sister jurisdictions that have adopted the Supreme Court’s conclusion that in reviewing sufficiency of the evidence claims the evidence "must be applied with explicit reference to the substantive elements of the criminal offense as defined by state law.”
Jackson v. Virginia,
. The government contends in its brief that expert medical testimony was not required. While the government may be correct, expert testimony would have been properly admitted because many of the medical terms used in the medical records and the effects of the wounds on the victims were beyond the ken of the average layperson.
See (Gregory) Nixon
v.
United States,
. Mejia was also stabbed once in the back by an unknown assailant.
. It appears from the medical records that the surgery Mejia was referring to was the insertion of a chest tube.
. See supra, note 7.
. The government, wisely, makes no contention that Mejia suffered from a protracted loss or function of a bodily member or organ. Because the record is silent as to any evidence that might suggest Mejia suffered from loss or function of a bodily organ, we do not address the point here.
. The evidence showed that each of the victims either ran to the school nurse’s office or was escorted to the nurse’s office with the assistance of another. There was no evidence to suggest that at any point the victims were rendered unconscious; therefore, unconsciousness is not a factor that this court needs to examine.
. The government, however, may not elect to re-try Palacio because the jury acquitted Pala-cio of the AAWA count for the assault of Mejia.
. The trial court instructed the jury that, “[it] may find the defendant guilty of the crime charged in the indictment without finding that he personally committed each of the acts that make up the crime.” The court then proceeded to instruct the jury on the elements that constitute aiding and abetting.
