Anakin had pissed and moaned throughout the entire movie. He was likely out of gasps, yelps, and whines...
So he could lay next to ObiWan for Dooku to drop crap on.
Because then he'd have to release Star Wars

pecial Olympics Edition where everyone has an artificial limb...
Welcome to Plot Convenience Playhouse.
He defeated (sorta) Darth Maul but can't kick Dooku's 80-year old ass? PLEASE!