Was he hiding the umbrella behind his back and threatening police officers with it while approaching when they were telling him to show his hands? That's not inhumane, that's a dumbass getting shot for being a dumbass.
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But you've admitted to never firing a gun before, so what you think is irrelevant because you have no actual experience. What happens when you miss the limb because its a low percentage shot and the bullet ricochets? What happens if that ricochet kills someone?