I'm sure getting hit in the noggin enough can do this to just about anyone.

There's a lot that happens when someone gets knocked out. If you've ever seen someone coming out of being knocked out, you can see the confusion in their eyes. We don't get to see this guy's eyes, but his actions after he gets pummeled are plenty to show his confusion.

After taking quite a beating in a very short time, the fight is called, and the referee steps in. Apparently he didn't hear the uproar, bell, or referee, cause he kept fighting. Except the person he's fighting is the ref!