Bears. They have something that is more deadly to me than most other things. Quickpaw. Not the attack where they stand up on two legs, the other one that comes out of nowhere. I will be winding up a power attack or beginning a strike after a block. Quickpaw is played and I'm suddenly stunned, gravely injured, and open. Some bears even have the sadistic schaudenfreude to chain quickpaw. Once they play that game, game over.