It appeared to me that Rondo was just tolerating the interview, like he was made to do it by the team and he didn't want to. He may have been kidding but I doubt it. Karl has a specific way he wants to play and Rondo has a specific way he wants to play.
I have not seen any Sac preseason games but based on the limited body language I saw in the interview, I would say he is not having fun playing basketball right now. If that is the case, that is really a shame. This is really about his last chance and he is not going to succeed if his heart is not in it.