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 was one of those who has given help and assistance to this type of guy countless times. No one on one of my crews treated one of our “customers” this roughly and would have reported a police officer who did. We treat everyone on the left coast with kid gloves. But the headline of the thread was greatly exaggerated as is your description of the event. And how drunk or high this guy was is questionable as I have seen many come back to life almost immediately. My guess is that this clown was probably a regular and we do not know the full story.