Just charge him with animal abuse, these apes only learn the hard way so kick them in the face whenever you can.
https://foxbaltimore.com/news/local/city-police-officer-sentenced-60-days-for-not-stopping-assault-will-now-serve-no-jail-time-christoper-nguyen-kenneth-sommers-wayne-brown-baltimore this article says the police officer lost his job and got sentenced to 18 months probation for failure to detain and restrain the suspect in order to protect the victim, and the assailant who kicked him got 12 years in prison. Before the officers arrived the assailant had already beaten the victim with several blunt objects such as a a cardoor mirror, and a metal compressed air cylinder, knocking out some of the victims teeth, and breaking multiple of his bones. He had also stabbed the victim 4 times with a knife.