New Jersey § 2c:3-5

§ 2c:3-5.

a. Subject to the provisions of this section and of section 2C:3-9 , the use of force upon or toward the person of another is justifiable to protect

a third person when: (1) The actor would be justified under section 2C:3-4 in using such force to protect himself against the injury he believes to be threatened

to the person whom he seeks to protect; and (2) Under the circumstances as the actor reasonably believes them to be, the person

whom he seeks to protect would be justified in using such protective force; and (3) The actor reasonably believes that his intervention is necessary for the protection

of such other person. b. Notwithstanding subsection a. of this section: (1) When the actor would be obliged under section 2C:3-4 b. (2)(b) to retreat or take other action he is not obliged to do so before using

force for the protection of another person, unless he knows that he can thereby secure

the complete safety of such other person, and (2) When the person whom the actor seeks to protect would be obliged under section 2C:3-4 b. (2)(b) to retreat or take similar action if he knew that he could obtain complete

safety by so doing, the actor is obliged to try to cause him to do so before using

force in his protection if the actor knows that he can obtain complete safety in that

way; and (3) Neither the actor nor the person whom he seeks to protect is obliged to retreat

when in the other's dwelling to any greater extent than in his own.