Comment: What makes you think I was defending anyone

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In reply to comment: They could have fled at any point. (see in situ)

What makes you think I was defending anyone

But cops have to stick with their training in situations like that. If a guy is coming at you with a knife, you don't have time for a committee meeting to decide alternatives.

Shoot a warning shot? And risk hitting someone?

My stepfather was murdered by a nut case running around with a knife. A nut with a knife demanding to be shot is a threat to everyone on the street.