As to the video, I have zero idea about what went down before this, so I'm not ready to turn anyone into a villain or folk hero based on two minutes of footage. But if circumstances warrant, there's nothing wrong with a sucker punch. If you want rules or forced notions of honor and respect, go watch boxing or MMA. That's not how fights play out in the real world. A fight isn't two guys punching each other in the face until one falls down, it's people trying to harm the other person in any way possible.