She put down her quill and stood staring the boy down. "Let me Give you a hint. The correct, polite way to address me is 'Excuse me professor, I'm new, or I'm not very bright, I'm not quite sure who you are. Please enlighten me.' Though if you are not a total dolt, you'd figure out I am the potions professor." She sat back down and threw another knockback and said "Try. Again."