Then after all that he says something about my voice, and that he can't concentrate and needs to go to the bathroom. When he comes back he tells me he isn't feeling too well and has to go...
On one hand, maybe he wasn't feeling too well. On the other hand maybe he was just trying to put up a good image during the interview when I asked him what he knows and just said yes to everything.
Update : It seems like the guy was sick, he felt that it wasn't nice to cancel the interview and decided to wing it even though he was having a high fever. Hmmmm.. not sure how to look at his choice of priorities.