Sorry, they had it coming.
The guy was acting like an idiot, ok.... take him down, arrest him and drag him off.
But no, they had him down, out numbered and the cop still felt like he needed to hit the guy multiple times with the knight stick while he wasn't a threat..... so they got what was coming to them and a taste of their own damn medicine.
Police do not have absolute authority to treat anybody as they damn well please & use excessive force just because they're on a power trip...... jabbing the guy with a knight stick multiple times while down on the ground, out numbered and no threat to anybody is the exact same as when police taser the crap out of someone multiple times because they're giving attitude.
Police brutality..... say hellow to mob brutality.
Follow procedure and you won't have anything to worry about.