His eyes linger on the glass, only paying attention to her question in retrospect. For practically forcing himself into her room, she's putting on every effort she can to seem uninterested. It's out of respect for her skill that he doesn't take the initiative to grab her attention that way again.

"I was afraid if I left, you'd have taken over the place before I got back." Smiling, if she catches it, as a way of downplaying his initially obvious intentions. A little humor goes a long way.