He does seem a bit "off" from what he normally looks like/acts like in his interviews and such. I think it's a mix of what happened to him recently, figthing a man who beat him twice, just coming off losing his belt, etc, etc. I don't think it's so much as being nervous, as it is just getting back in there, clearing his head, and trying to relax and not get worked up over a big fight ahead.
"You lack the requisite spine and testicular fortitude to study under me"
“You do not know the first note of the music that moves me.”