Van Damme is about a much of a fraud (when it comes to fighting, anyway) as Dux is; while he's very fit and limber, Van Damme once got knocked out with one punch by a bodyguard at the Scores strip club in New York.

Not that I am defending Van Damme or anything, but you can't really train yourself to not get knocked out by a punch. There's not really a lot of head-conditioning you can do. If someone gets a lucky shot... Well. *shrug*