wait, what?

I was reading my feeds, and the MMA Junkie article today on Chuck not retiring came up. I tried to read it but couldn't get past the first paragraph or two:

The questions were posed repeatedly well beyond the point of aggravation, yet Chuck Liddell stood his ground and fired back, not with the knockout ferocity that once led him to seven straight knockout wins (one shy of the UFC record held by Royce Gracie, Anderson Silva and Jon Fitch) but with buoyancy that earned him his famous moniker.

Emphasis mine. What? Buoyancy got Chuck his nickname? I think not.

[UWC Question] Was there pressure on the fighters that night knowing that they could be on network TV for the first time as part of the Best Damn Sports Show Period?

[Chuck Liddell] No, that doesn’t bother me at all. I don’t get nervous, that’s why I got my nickname. I’ll fight in front of 2 people or 50,000 people - a fight’s a fight.

So...buoyancy. That's almost as intimidating a physical characteristic as...uh...viscosity? "OH SHIT, RUN! THAT GUY CAN FLOAT!"