Basically, it's because there's probably a big bodyguard waiting to smash you up real bad.
For rapper Riff Raff, that bodyguard is 6’9, and weighs about 295-pounds, so suffice to say when he hits you, you're going to know about it. Especially if he hits you this hard:
We're going to assume that this guy probably didn't try getting on stage again that night, if he actually got back up.