Cass looked up with a smile the moment he heard Percy's voice, the drumming stopping almost at once. It took a moment even to realise that he had been doing it, but then he gave a slightly sheepish smile.
'Just because I drum my fingers doesn't mean that I can't focus,' he said with a smirk. 'But yes, I'm bored,' he said, ordering the book to move as Percy sat down.
'Could you,' he indicated the still floating book. 'A medi-witch put it up for me and without a wand-' He left the sentence unfinished.