The facts of this case demand an application of the peculiarly perplexing rules of law relating to remote and superseding causes of injury. A superseding cause is an act of a third person or other force which by its intervention prevents the actor from being liable for harm to- another which his antecedent negligence is a substantial factor in bringing about. An intervening force may be either a superseding or concurrent cause of injury, depending upon a number of causative factors involved. It may be either dependent upon or (as in this case) independent of the original negligent act, and yet be such that, except for the existence of both negligent acts, the injury would not have occurred. The original act of negligence may be passive, that is, harmless unless something further occurs but capable of being made dangerous by the operation of some new force, as occurred in this case. Under such conditions, the fact that an intervening act of a third person is itself negligent, and acts upon the original passive negligence so that injury occurs which otherwise would not have occurred, does not necessarily operate to make
*769
the second act of negligence by the third party the sole proximate cause of injury and thus insulate the original wrongdoer from liability where the original wrongdoer at the time of his negligent conduct should have realized that a third person might so act, or, as a reasonable person knowing the situation existing when the act of the third person was done, would-not regard it as extraordinary that the third person would so act. Restatement of the Law, Torts, §§ 440-447. For applications of these rules of law in Georgia, particularly on the question of the original wrongdoer, as a reasonable person, anticipating that “the second or intervening act might, not improbably but in the natural and ordinary course of things, follow his act of negligence,” see
Bozeman
v.
Blue’s Truck Line,
62
Ga. App.
7 (
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The record here shows no offer to amend this petition in the trial court, nor has a request to allow time for amendment been made in this court (in which connection see Code § 6-1610;
Green v. Massee & Felton Lumber Co.,
6
Ga. App.
389,
The trial court did not err in sustaining the general demurrer and dismissing the petition.
Judgment affirmed.
