He feels something trying to wiggle in his mind - something trying to affect his behavior, something trying to rile up his emotions. If his mind wasn't so vast and fragmented it'd have done something nasty, although he is not sure what. He does however feel a bit of anger and frustration - although he doesn't know if it comes from the spell or from himself.

"You are starting to be annoying," he says while getting up, his playful tone replaced by a dangerous one. "Thoughtless lashing out is no fun. Give me a better fight or I'm ending this right now."