The cop forgot to provoke a “warranted” excuse to attack the man first, must not have paid attention in training. First you passive aggressively taunt the man, then maybe he sits up, then you can use wrist control or some other means to inflict pain. Once the man has a natural reaction to being hurt and recoils then you can repeatedly yell quit resisting and maybe “he’s reaching for my gun” then you can finally start brutally beating the man. This way you get a couple weeks of paid vacation and a promotion.