The officer calls for back up claiming that the kid is resisting arrest, then puts him in a headlock, and says “this is not going to work out for you buddy.”
As the kid complains that he can’t breathe, the officer appears to have the situation under control, and convinces the kid to lay face down and put his hands behind his back.
Then another officer comes tearing in from out of shot and throws his knee into the kid’s head.
“MOVE AND DIE. MOVE AND F***ING DIE. YOU GONNA MOVE AGAIN? F***ING MOVE AGAIN. F***ING MOVE AGAIN.” the cop yells, before also yelling at the person videoing the incident.