When I hear someone biting someone else, reminds me of behavior of an aggressive dog or animal, not a human being. He definitely needs help, otherwise it could up "biting him back", although from the sounds of things, it may already happen.
My friend who also saw that believes someone or something should bite Luis Suarez back, giving him a taste of his own medicine...
The way Luis Suarez is biting people, maybe he is underneath a cannibal waiting to happen?