5.4.1: Defense of Others

According to early common law, a defendant could use force to defend another only when the defendant and the person defended had a special relationship, such as a family connection. Most jurisdictions now reject this common-law restriction on defense of others and allow a defendant to defend anyone to the same degree that he or she could use self-defense (People v. Kurr, 2010). Thus in a majority of jurisdictions, defense of others requires the same elements as self-defense: the individual defended must be facing an unprovoked, imminent attack, and the defendant must use a reasonable degree of force with a reasonable belief that force is necessary to repel the attack.

Occasionally, a defendant uses force to defend another who has no legal right to use force in self-defense. Under the common law, the defendant could not use force legally if the individual defended could not use force legally in self-defense. However, the majority of states now allow a defendant to use force to defend another person if it reasonably appears that use of force is justified under the circumstances (Commonwealth v. Miranda, 2010). The Model Penal Code allows the defense of another when “under the circumstances as the actor believes them to be, the person whom he seeks to protect would be justified in using such protective force” (Model Penal Code § 3.05(1) (b)). Thus if the defendant has a subjective belief that the individual defended could use force legally in self-defense, defense of others is appropriate under the Model Penal Code.

Example of Defense of Others 

Alex and Shane, aspiring law enforcement officers, are performing a training maneuver in a rural area. Their instructor Devin is watching nearby. Alex pretends to attack Shane. Just as Devin is about to demonstrate a takedown, Timmy, who is jogging in the area, dashes over and begins beating Alex. Under the older common-law rule, Timmy could be successfully prosecuted for battery of Alex. Shane did not have the right to use self-defense during a practice maneuver, so neither did Timmy. In jurisdictions that allow defense of others if it reasonably appears that self-defense is warranted, Timmy could probably use the defense to battery because it reasonably appeared that Alex was about to unlawfully attack Shane. In jurisdictions that follow the Model Penal Code, Timmy can most likely use defense of others as a defense to battery because it is clear Timmy honestly believed Shane had the right to use self-defense in this situation.

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