It's actually quite hard to shoot someone in the hand, which is small and can move pretty quickly. It can be done, but it takes a degree of skill and precision that most regular folks just don't have.
About seven hours ago, I graduated from our city's Citizens Police Academy. One of the sessions involved putting us through Shoot/Don't Shoot scenarios, where we were given a "gun" and had to react to various computer-controlled situations shown on a large movie screen.
I'm an experienced target shooter and I participate in timed matches, where the clock adds just a little tension. Under those circumstances, hitting a stationary target at all, let alone hitting a specific point on a target, is comparatively easy, but misses do happen.
In the Police Academy scenarios, the targets were moving, popping up out of unexpected places and shooting back. We were told to aim for the Center of Mass, aka the torso, since that is the easiest area to hit. I never did hit the torso, although I did manage to accidentally hit everything else.
Point being, "Just shoot the weapon out of his hand" is something that is only said by someone who knows nothing about firearms or armed combat. It's damned hard to hit a moving target at all, and I can only try to imagine what it's like when you're scared stiff. And I can almost guarantee the shooter here was scared stiff.
Shoot the weapon out of his hand, or shoot to wound? Good luck with that, you're going to need it.
Btw, that kid is probably going to need months, if not years, of counceling. He'll learn to live with it, but it'll be part of him for the rest of his life.
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