Read the whole story, the man got jailed and deported because after the video went viral the local authorities investigated his profile and found out that he was teaching illegally. These stories have only one goal: to scare the foreigners from doing anything when they get into troubles, so they can be abused all year round by frustrated virgin local men. You can punch back if you are 100% legal on a working visa tied to your employer, but don't make a scene if you are teaching on business or tourism visa.

I have fought more than once in China, local diaozi (loser) youth angry at foreigners for dating Chinese girls and other usual insecurity reasons. Anyway, I never punched first, but I punched back and usually much harder than those sissy men, I even won a case that ended up in court after I broke a dude's nose, thanks to a video recording made by my friend (also Chinese) who was there, I could have asked for some HUGE compensation but the man looked like a poor worker so I left him go on with his life.

If you are legally living here then you have nothing to fear from the legal system in China, not more than you would back home, if some local jerk decides to mess with you show them who's the real man, but remember, never punch fist, what they see on videos is what happened, no discussion.