He was injured in Guangzhou. If there is evidence, the police will arrest him.
Generally speaking, if it is not serious, you will be advised to settle it. If it is not settled, it depends. Generally, you will be detained for a few days if you have a skin injury. If you have a criminal injury, you will have to undergo a medical examination to determine the injury. The definition of minor injuries in China law is SB, and only if you are disabled can you be considered minor injuries. Therefore, beatings are usually settled after a few days of detention. Even if you are disabled, you can sit for five years at most.