I am far from an expert in this area, but I always thought that the only time for a civilian to pull a gun is when they intend to pull the trigger. In this instance, outside my home, I would tell the perp to leave and do so quickly. If he advanced on me with a knife in his hand, and I pulled a gun, the only shot would be in his chest. I am not sure I would try to hold someone at gun point outside my home. (Inside my home would be a different story). If, as someone proposed, he had, unknown to me, committed a murder in one of the homes prior to breaking into my car, and he left at my command, I would consider finding and detaining him to be the job of the police.

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Robert
SWCA #2906, SWHF #760