@InvaderGzim
One thing people often forget to mention is that you should never try to shoot only to wound an attacker. Extremities are a pretty low percentage shot especially with adrenaline flowing, and non-critical wounds might not stop the attack.
You need to stop the attacker, and the reality is that likely means you will have to end them. Aim for center mass.
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And the thresholds for “self defense” are separate from what the final outcome is. If you can prove that proportionate self defense was required, finish the job.