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While not a good idea, I think he would have been better off claiming that he pulled the gun out intending to defense himself and inadvertently fired in the air instead of at the thugs who were threatening his life/serious bodily injury. If he had said that, he would be fine maybe.

I don't like warning shots either, but in this case, it seems he was already justified in pulling the gun so the only issue is he fired up instead of at the threat. To me, the warning shot issue is usually when someone is not yet threatened, but in this case, he can make the case that he was.