Thank you, I am glad someone else here bothered to watched the entire video with an eye for detail.
I watched it... The guy was drunk or drugged out, he needed HELP and ASSISTANCE not a drop to the ground several times making him hit his head on the concrete. Then the officer did physically punch him in the head at the last for no just cause.
I watched it, too. Not a lot to watch. The cop tells the critter to get up and the critter remains limp. The cop gets on his radio for a little bit and then tries to move the guy again. Still unresponsive, the cop drags the guy by his outer garment. No big deal. Not like the cop beat the snot out of him or anything.