If an immigrant conducts a violent crime in China, then he can expect his anus to be wrecked inside some of the detention facilities.
Doubt that. Asians have a slightly more different MO than that in my experience. He won't be lucky enough to get to prison. They're probably going to literally rip him to shreds then and there in the street where they catch him. Nothing but a mass of blood and gore will remain of his body.