The sorcerer waits, arms folded, and frowns mildly. He says nothing for a moment, letting his student work through the problem, but as soon as the energy begins to feed back onto him, he cancels the spell with a gesture. "Good," he says quietly. "But why are you angry? I'm trying to teach you, not harm you. You have control over your power, but your temper worries me. I think it's time for a break."

There's no accusation in his voice, calm and even, but this is clearly his final word on the matter.