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What I tell myself I would have done differently in this situation would be to not let the other person know I am carrying at all. If a person approaches my vehicle in this manner, I would lock the doors and roll up the windows, or just crack my window enough to converse if I feel it would help; in other words, stay in the vehicle and keep him out. Then I activate the video recorder on my phone and capture everything he does, while offering a few attempts to de-escalate, catching that on the video (my audio). Do I pull my gun? Perhaps, but I'd keep it hidden and easily accessible, not letting him know I have it unless I plan to use it.

Ofcourse this is if I cannot simply drive off, i.e.: I am blocked in, then I'd just record his actions until he left on his own, or until he escalated to the point where I felt my life was in danger (you know what happens next).

By telling him you were armed he acted on that knowledge to try and "get you in trouble" telling the cops you were waving it around.