Section 13-405 - Justification; use of deadly physical forceA. A person is justified in threatening or using deadly physical force against another: 1. If such person would be justified in threatening or using physical force against the other under section 13-404, and2. When and to the degree a reasonable person would believe that deadly physical force is immediately necessary to protect himself against the other's use or attempted use of unlawful deadly physical force.B. A person has no duty to retreat before threatening or using deadly physical force pursuant to this section if the person is in a place where the person may legally be and is not engaged in an unlawful act.