Like a deer caught in the headlights, Mason's eyes widened when he realised that the librarian had turned around to face him. He honestly hadn't meant to interupt and had only stopped to watch if he could really play or not. The tuning of the violin had been impressive enough for him. The only thing he could do was read like a couple of music notes and he often mixed them up as well. So yes, even tuning an instrument was concidered impressive from the Ravenclaw as he could not even hear the difference.

"Sorry, i didn't mean to..." he vaguely gestured towards the violin in the man's hand but before he could say anything, another voice made him jump. Turning his head to the side, Mason nodded his head at Professor Marchand in slightly stunned greeting. It was kind of rare meeting a professor outside of their offices because they probably had to make lesson plans and grading their homeworks so meeting two in one room was slightly odd.

"I think he can" he said, answering the question.