Charlie raised an eyebrow, not entirely sure how to take that. Kids his age and younger were expected to ask to be excused in his time. Maybe they weren't in Luther's? Maybe it was offensive to him? Somehow...
Charlie picked up the books he had collected along with the communication pad, and stood up. He was used to carrying piles of textbooks at school, this was easy.
"Thank you, sir..." That was all he said before he left the library. Some habits were just too darn hard to break.