If anything most people were predictable, he thought as he took note of the small huff. If it was exasperation with him or not being able to find what he had taken, that also didn't really matter, he mused. Gauging people's reactions, that did. So he continued to look on, though he couldn't help but smile a little.
"You know. That is a sound theory. The castle has hidden things, like a key. Probably others before I arrived. Anything is possible," he said following along without missing a step. "I do admit I'm curious. What do you mean by leave exactly?" He asked, honestly interested.
"Reading is always a pleasure, Hermione. This time is just for leisure."