he definitely seemed to have a bit more energy than in the Calzaghe fight, but i think it was just his gameplan..

in the calzaghe fight he wanted it to be a rough and tough fight and he knew that he wasn't going to match speed and output with joe, so he fought the fight he thought would get him the W..

with pavlik he knew that he couldn't let kelly take shots at him so he had to get off first as much as possible, and then counter when pavlik retalliated..

I also think it had a lot to do with the psychological fact that he knew he was hurting Kelly.. When you hit someone and you see them wobble, it's only instinct to go at them, and your adrenaline increases even more.. He looked tired at the end of every round when he sat in the corner, but he just kept coming, and as long as he was staying effective, that was all he needed to push him to continue doing what he was doing..

i bet if kelly had one big round in the 5th or 6th, where he even caught bernard with two or three big shots that bernard wouldn't have come up so gung-ho afterwards..