Tyson will always have a good punch. He can KO just about anyone if he lands a clean shot but as he's getting older his ability to take em isn't getting any better.
Shadow, you gotta admit that Tyson was handling Williams quite easily before he tweaked his knee. Especially since it was his pivot knee, he couldn't even put any power into his shots after that. I'm sure he pretty much knew it was over once that happened.