He blinked. "Oh right, sorry. Hullo," he said, chuckling a bit at himself. "Professor Longbottom - Neville. Herbology," he said, again shuffling papers and plants so that he could offer her his hand because it was polite to do so. He grinned a bit, "Sorry if I disturbed you, I was just... walking past the classroom, and I didn't think we'd met before. Thought I'd... introduce myself."
He paused, "I could come back if this is a bad time," he said, eyes turning down the hall as though looking for an escape route.