I just noticed something else too.
When they started to open fire, Beiber's arms went flailing about, but in the next shot, he was still holding the gun straight, with his other arm down as he fell.
So they shot him, and he dropped the gun,
AND FASTER THAN A FRAME CHANGE
He picked up the gun, and was ready to fire off another round.
Reiterating what I previously stated: He is a fast motherfucker.