Don't give a fuck about the video, copper never saw a gun, shot the guy without ever seen a gun in his hand or anywhere else.
Don't give a fuck about how the copper felt either, he was anxious, twitchy and no matter what the guy would get shot. The guy stops moving and has his hands down, he's dead, the guy pulls his hands out and the cop will think he's pulling a gun he doesn't see out, the guy's dead. Twitchy cop in a benign situation ends with innocent guy dead. No biggie, it wasn't you this time.
Don't give a fuck about race bullshit except for actual facts and statistics.
Twitchy copper murdered and innocent civilian, end of story.