2005 Arizona Revised Statutes - Revised Statutes §13-406 Justification; defense of a third person
A person is justified in threatening or using physical force or deadly physical force against another to protect a third person if:
1. Under the circumstances as a reasonable person would believe them to be, such person would be justified under section 13-404 or 13-405 in threatening or using physical force or deadly physical force to protect himself against the unlawful physical force or deadly physical force a reasonable person would believe is threatening the third person he seeks to protect; and
2. A reasonable person would believe that such person's intervention is immediately necessary to protect the third person.
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