Looking at the video again.
"ShowMeYourHandsGunGunGun!*Bang**Bang*" Less than 2 seconds from the start of that 'sentence' to shooting. Can anyone really argue that there was sufficient time in that for the guy to comply to the command, and the cop to in any real way assess what he had in his hand?
Also noticed it said the helicopter spotted someone, but didn't say, and certainly didn't show, them seeing him doing anything illegal.
The two most important points here...
both being ignored by those who will ignore every fact and substitute every negative assumption to declare that the death penalty - without a trial - is just fine by them (as long as the person killed by police is black)