OPINION
In 1987, Wolfgang and Nancy Monthofer were co-trustees of the E.M.W. Family Trust, an entity which served as the sole general partner of another entity known as Monthofer Investments Limited Partnership (“MILP”). Mark Allen was the Monthofers’ attorney.
In August 1987, as part of a complex real estate transaction, Allen arranged for MILP to assume liability on a full-recourse promissory note (“the Note”) held by Goodbuck Investors Limited Partnership Number 3 (“Goodbuck”). In preparing the necessary documents, however, Allen mistakenly identified the Monthofers as general partners of MILP, when he should have identified E.M.W. Family Trust as the true general partner and the Monthofers as merely co-trustees of E.M.W. Family Trust. By signing as general partners, the Monthofers assumed personal liability on the Note.
MILP made the first annual payment on the Note in April 1988, but failed to make the payment due in April 1989. Goodbuck sued the Monthofers, alleging default. The Mon-thofers then filed a combined answer and third-party complaint against Allen, alleging that their personal liability, if any, arose from Allen’s negligence in identifying them on the Note as general partners of MILP.
The parties to the Goodbuck-Monthofer lawsuit eventually entered a settlement agreement that called for a stipulated judgment to be entered against the Monthofers “in an amount equal to the total amount due and owing under the Note, including ... interest, late charges, litigation costs, and attorneys’ fees.” In exchange for Good-buck’s agreement not “to record, collect, or execute upon the stipulated judgment,” the Monthofers promised to pursue their third-party claim against Allen and to assign any proceeds to Goodbuck to the extent necessary to satisfy the stipulated judgment.
The Monthofer-Allen claim prоceeded to trial in April 1993. At the close of the Monthofers’ case-in-chief, Allen moved for a directed verdict, asserting that the Monthof-ers’ non-execution agreement with Goodbuck eliminated any damages from Allen’s alleged malpractice. The trial court agreed that the non-execution agreement eliminated the face *424 amount of the Goodbuek-Monthofer stipulated judgment as an element of damages, and directed a verdict for Allen on that issue. But the court permitted the Monthofers to proceed against Allen for the attorneys’ fees they had incurred during the Goodbuek-Monthofer suit and for any damage to their credit rating from the Goodbuek-Monthofer stipulated judgment.
After a jury found for Allen on the surviving claims, the Monthofers appealed, raising three issues: (1) whether the trial court committed reversible error by eliminating the faсe amount of the Goodbuck-Monthofer judgment as an element of their damages; (2) whether the trial court erred by admitting the Goodbuck-Monthofer settlement agreement into evidence; and (3) whether the trial court incorrectly instructed the jury on the law of attorney malpractice. We address each issue in turn.
I. THE NON-EXECUTION AGREEMENT AND DAMAGES
We first consider whether the trial court erred in granting Allen a partial directed verdict striking the face amount of thе Goodbuck-Monthofer judgment as an element of the Monthofers’ damage claim against Allen.
Damages are a necessary element in a legal malpractice action, as in any negligence action.
Phillips v. Clancy,
In this case, these questions are essentially the same. Given the face amount of the judgment, there is nothing speculative or unascertainable about the amount of damages, if any, attributable to the judgment. The question is whether the judgment, although certain in amount, constitutes a damage element at all in light of the non-execution agreement.
A. The Judgment Rule
To support their position that the non-execution agreement did not eliminate the Goodbuek-Monthofer stipulated judgment as a damage item against Allen, the Monthofers argue that Arizona courts should follow the “judgment rule.” The judgment rule treats the full face amount of a judgment as a loss to the judgment debtor even if the debtor has made no payments оn the judgment.
See, e.g., Roebuck v. Steuart,
Allen does not dispute that Arizona courts should follow the judgment rule. However, each of the judgment rule cases cited by the Monthofers was grounded in a judicial concern, absent in this case, that a plaintiff'judgment debtor faced the imminent threat of execution on the underlying judgment.
See Roebuck,
B. Mitigation and the “Damron” Cases
Allen argues that the non-execution agreement constitutes a total mitigation by the Monthofers of any damages they might oth *425 erwise have sufferеd from the Goodbuck-Monthofer judgment, eliminating the judgment as a damage element against Allen.
We distinguish for the purpose of this discussion between two related issues: (1) Does the non-execution agreement constitute a mitigation of damages inuring to the benefit of Allen? (2) If not, is the jury entitled to consider the non-execution agreement as evidence that the Monthofers too readily capitulated to a judgment and failed to mеet their obligation to Allen to mitigate their damages? We defer the second question to Part II of this decision. To answer the first question, we distinguish a covenant not to execute from a release.
If, as a result of the Goodbuck-Monthofer negotiations, Goodbuck had released the Monthofers from any liability on the Note, the Monthofers would have avoided the substantial consequences of Allen’s alleged malpractice, and Allen would face liability to the Monthofers only for incidental costs associated with the Goodbuck-Monthofer suit.
See
66 Am.Jur.2d
Release
§ 1, at 678 (1964) (“A release is the giving up or abandoning of a claim or right to the person against whom the claim exists or the right is to be enforced or exercised.”);
see also Kay v. Bricker,
However, the Monthofers did not obtain a release from Goodbuck; nor did they achieve by settlement any reduction in the note amount. To the contrary, Goodbuck obtained a personal judgment against the Mon-thofers for the full amount due under the Note in exchange for Goodbuck’s contractual promise nоt to execute. The Monthofers claim, by reference to numerous
“Damron
agreement” cases, that such a promise does not mitigate, vitiate, or eliminate in any respect the damages flowing from the judgment.
See generally Damron v. Sledge,
In a typical
Damron
agreement, an insured transfers his indemnity claims against his insurer to a judgment creditor in exchange for the judgment creditor’s covenant not to execute against the insured.
See, e.g., Damron,
A covenant not to execute is merely a contract and not a release____ It seems reasonable to conclude, therefore, that the insured’s tort liability remains but that he has an action for breach of contract if the [judgment creditor] attempts to collect the judgmеnt in violation of the covenant.
Blomfield,
Allen argues, however, that the Blom-field/Paynter conclusion that damages survive a non-execution agreement is merely a legal fiction indulged as a matter of policy to protect the public from insurers who “deliberately breach specific contractuаl duties” to their insureds. Arguing that no policy justification supports such a fiction in the current context, he argues that the Damron cases are inapposite to this case.
Our reading of those cases does not support Allen’s effort to confine them. First, neither
Blomfield
nor any of the other
Dam-ron
cases mentions or purports to indulge a
*426
legal fiction. Second, our courts have held, in contexts other than disputes between insurers and insureds, that covenants not to sue or not to execute are contracts, not releases.
See, e.g., Hovatter v. Shell Oil Co.,
Allen next attempts to differentiate
Blom-field
and other
Damron
cases as claims pursued in the assignee’s name, eliminating any risk that the jury might be misled. In this case, by contrast, Goodbuck did not carry the claim forward; the Monthofers continued to pursue it in their own name. We acknowledge this distinction, but do not find it a persuasive basis for treating the covenant not to execute as extinguishing damages in this case. Rather, we find it an aspеct of the parties’ alignment that warrants trial court vigilanee in the conduct of the trial.
Cf. Sequoia Mfg. Co. v. Halec Constr. Co.,
C. The Abandoned Issue of Assignability
Allen seeks in passing to distinguish the Damron line of cases on the ground that a legal malpractice claim is unassignable, unlike an insured’s bad faith claim against his insurer. In the single paragraph that Allen devotes to this argument, however, he does not explain how one can reason from the premise that the Monthofers attempted an unenforceable assignment of their claim to the conclusion that the Monthofers thereby extinguished thеir supposedly unassignable claim. 3 Further, Alien conceded at oral argument that the issue of assignability was abandoned in the trial court and not preserved for this appeal. 4
*427 We are nonetheless asked by amici curiae to resolve the question whether the Monthofer-Goodbuck agreement constituted an invalid assignment. 5 We decline to address an abandoned issue in this case to assist amici in the resolution of аn independent case. Instead, we confíne ourselves to the issues that have been preserved.
D. Holding and Consideration of Harmless Error
We have cited Blomfield and Paynter for the proposition that damages survive a non-execution agreement. Finding no basis to distinguish those cases, we hold that the non-execution agreement gave the Monthofers a contractual right against Goodbuck, but did not mitigate or eliminate the damages associated with the Goodbuck-Monthofer judgment. There wаs, accordingly, no basis for the trial court’s directed verdict striking that judgment as a damage element in the Mon-thofer-Allen negligence claim.
Allen asserts, however, that the directed verdict, if erroneous, was harmless error. Allen argues that, because the jury rejected the Monthofers’ other damage claims, the jury must have determined that Allen was not liable for any damages. We cannot agree. The trial court instructed the jury, “Befоre you can find [Allen] at fault, you must find that [Allen’s] negligence was a cause of injury to the Monthofers.” The court also instructed:
The Court has determined as a matter of law that the Monthofers have not suffered any actual damages from the stipulated judgment because of the Covenant not to Execute. You shall not award any damages for the amount of the stipulated judgement [sic]. You may however, consider the stipulated judgment and Covenant not to Execute in determining whether the Monthofers have suffered any actual damages that flow from the entry of judgment.
If you find Mark Allen liable to the Monthofers, you must then decide the full amount of money that will reasonably and fairly compensate for each of the following elements of damages proved by the Mon-thofers’ evidence to have resulted from the fault of Mark Allen:
(1) Reasonable and necessary attorneys fees incurred by the Monthofers in defending the Goodbuck lawsuit; and
(2) Any damage to the Monthofers’ credit resulting from the stipulated judgment and covenant not to execute.
The court also instructed the jury that it was “not permitted to award speculative damages.”
There was ample room within these instructions for the jury to have found Allen at fault but to have returned a defense verdict because it found the Monthofers’ evidence regarding attorneys’ fees and credit damage inadequate to support a damage award. Because the outcome might have been different if the trial court had permitted the jury to consider the Goodbuck-Monthofer judgment as an element of damages, we cannot find that the directed verdict was harmless error. We must therefore reverse and remand for a new trial.
II. ADMISSIBILITY OF THE SETTLEMENT AGREEMENT
The Monthofers also argue that the trial court improperly admitted the Goodbuck-Monthofer settlement agreement into evidence. We discuss this question because it is likely to recur on remand.
Though we have held that the non-execution agreement does not eliminate the judgment as an element of damages, we do not hold that the agreement is inadmissible. The details of the settlement agreement are
*428
potentially probative in two respects. First, they are potentially probative of the bias of certain witnesses. Second, they are potentially probative on the question whether the Monthofers failed to take reasonable measures to mitigate their damages
(e.g.,
by withholding valid defenses and precipitously agreeing to entry of an avoidable judgment for the full amount owing under the Note). A person injured by another’s negligence cannot recovеr for losses due to “avoidable consequences.” William L. Prosser and W. Page Keeton, The Law of Torts, § 65, at page 458 (5th ed. 1984) (cited with approval in
Law v. Superior Court,
We do not hold that the potentially probative value of the agreement
requires
its admission upon remand. Whether the probative value of evidence is “substantially outweighed by the danger of unfair prejudice” is a matter left to the sound discretion of the trial court. Ariz. R. Evid. 403;
see also Readenour v. Marion Power Shovel,
III. THE MALPRACTICE INSTRUCTION
The Monthofers finally argue that the jury was instructed improperly on the law of attorney malpractice. They object to the following jury instruction:
No lawyer is bound to know all the law. It is not an exact science. There is no attainable degree of skill or excellence at which all differences of opinions or doubts upon questions of law can be removed from the minds of lawyers and judges. If the law on a subject is well established and clearly defined and has existed and been published long enough to justify that it was known to the profession, a lawyer who disregards the rule or is ignorant of it renders himself liable for losses caused by such negligence or want of skill. However, where the area of law is not well-settled and clearly defined, a lawyer is not liable for an error in judgment if he acts in good faith and an honest belief that his advice and acts are well-founded and in the best interests of his clients.
Our supreme court has cautioned against instructions which “might cause jurors to view the evidence ‘in accordance with what they believe to be the court’s judgment as to its weight rather than their own.’ ”
Rosen v. Knaub,
Further, at least one court has rejected similar language as inconsistent with the law of negligence.
See Cosgrove v. Grimes,
Assuming, without deciding, that the core of the challenged instruction is consistent with Arizona law, an instruction along similar lines would be appropriate only if there were evidence to support its underlying theory.
Sparks v. Republic Nat’l Life Ins. Co.,
No evidence that would support such an instruction appears in the record before us. However, as Appellee points out, our record is incomplete and does not include the testimony of the parties’ legal experts. Accordingly, we underscore this issue for the trial court upon remand and do not attempt to resolve it at this stage.
IV. CONCLUSION
For the foregoing reasons, we reverse the judgment of the trial court and remand this case for proceedings consistent with this decision.
Notes
. Though none of the cases cited by the Monthof-ers concerned covenants not to execute, we note that other jurisdictions have applied the judgment rule to legal malpractice cases involving such covenants.
See, e.g., Jacobsen v. Haugen, 529
N.W.2d 882, 884 (N.D.1995);
Ammon v. McCloskey,
.
See generally City of Tucson v. Gallagher,
. It is one thing to assert that an invalidly assigned claim is an unassigned claim in the eyes of the law and that the assignee cannot pursue the action against a third party or require performance by a reluctant assignor.
See Schroeder v. Hudgins,
. Early in the lawsuit, Allen indeed asserted that the Goodbuck-Monthofer settlement agreement was an invalid assignment of a legal malpractice claim; he moved to dismiss the Monthofer-AIlen lawsuit on that ground. The trial court denied the motion, however, ruling that (1) the agreement wаs not an assignment but a security agreement, and (2) even if the agreement had aspects of an assignment, such aspects were severable pursuant to an express severability clause.
Allen did nothing thereafter to challenge the trial court’s characterization of the agreement as something other than an assignment; nor did he attempt thereafter, at the trial court or on appeal, to revive his assеrtion that the agreement, as an assignment, was invalid. In the pretrial statement, Allen did not identify the validity of the Monthofer-Goodbuck agreement as an issue that he continued to contest. Instead, he attempted to make affirmative use of the agreement, listing it as an exhibit tending to establish that the Monthofers, by capitulating to Good-buck, had abandoned viable defenses and failed to appropriately mitigate their damаges. Similarly, when Allen defended the admissibility of the agreement in response to the Monthofers’ motion to exclude it, Allen did not renew the argument that the agreement was invalid. Rather, he argued that it was admissible to establish the Monthofers’ failure to mitigate damages and to demonstrate the bias of the Monthofers and of witness John Lancy, a Goodbuck principal.
Allen similarly chose not to contest the validity of the agreement when he moved for directed verdict at the close of the Monthofers’ evidence. Nor did the court revisit that subject in ruling on that motion. The motion for directed verdict was confined entirely to the question whether, in light of the covenant not to execute embodied in the agreement, the Monthofers had proven any submissible damages.
*427 In short, the issue of the validity of the agreement vanished one and a half years before trial when the trial court characterized it as something other than an assignment and denied Allen’s motion to dismiss. Allen never revived the issue in the trial court and did not assert on appeal that the trial court’s ruling was wrong.
. Fennemore Craig, P.C., as amicus curiae, argues the invalidity of the agreement. Standard Chartered PLC, in a responding amicus brief, argues in favor of its validity. Amici are adversaries in separate, unrelated litigation, and it would guide the resolution of their separate case if we chose to resolve the question of assignability in this one.
