[user104658]

I've said before that I suspect the training is lacking.

If you think someone is armed you don't hop out of a car and charge at them fully in the open, leaving yourself exposed and vulnerable and in a situation where you might have to shoot someone four times and-then-one-more-for-luck because he (allegedly) made pew-pew fingers at you and you got a startle.

That should be common sense, but apparently it's not even procedure.

Edited to add "allegedly" - the video is obscured so you can't see whether he makes a hand gesture or not. I suspect it was probably an added detail to sweeten the story. Much like when they pretend to be covering him and shouting "don't move!!" when he's already full of bullets and clearly hasn't even twitched.