LAS VEGAS – At the Las Vegas airport on Sunday morning, Anderson Silva was a popular topic of conversation. “He got knocked out, finally,” I overheard one ticket agent telling another. “Seriously?” replied the other man. Who could blame him for being a little skeptical, assuming he knew anything at all about Silva’s history of dominance? Here’s where the first was obliged to do a brief reenactment, complete with Silva’s fake wobbly legs, the quick jolt to the jaw that followed, that lolling head of the very recently concussed. I have to admit, it wasn’t a bad impression. Then again, it’s hard to do the fake wobbly legs better than Silva himself, who, let’s be honest, was doing a fantastic imitation of a wounded fighter right before he became an unconscious one