Something about that smile made him stop walking for just a moment, feet stilling on the stairs. He recognized that - knew that smile so well that he was sure he could reach out and touch her and the heat of her cheeks would be completely his as well. Something he knew that he couldn't possibly know.
He tried to brush it off, but it lingered even as he started walking behind her again, and he had the faint feeling that he was actually nearly smiling.
"You're more clever than most," He answered, catching back up to her quickly.