WTF!!!!!!!!!!!!!!! He looks sick! what the hell is wrong with him. It looks like he is dying.
I think it's because he had a lot of his chi drained from him or his access to the chi that controls bending blocked off. He more than likely is slowly dying without his connection to the spiritual energy that is a part of bending. That, and I wouldn't put it past him to be having nightmares so bad he hasn't slept since the night before the championships.
Bending is as connected to a bender as hands are to an artist or intelligence is to a scholar. Imagine if you were an artist and something happened and you no longer have your hands. That is how a bender feels without bending.
Also, I cannot fix my hair without waterbending. I guess it looks okay..........