Where'd you hear that?
Chuck Zitos book. Pretty good read btw. He is former president of Hell Angels and and a black belt in karate aswell as black belt training with Renzo in BJJ and a Golden Gloves title. He is also just a tough as nails, no nonsense kind of guy so getting beat up by him isnt really that shameful.
I could link it but if you simply google Chuck Zito Van Damme you will get more then enough links if you want to further inquire into the incident.