Strange gives no indication of having heard, seen, felt or recognized Christine's presence in any way, shape, or form. He just stands still, slight frown on his face, as he rocks back and forth a little on his feet.

This really is interesting: there's no way of knowing that she's there. And it just now occurs to Strange that, if she wanted, Christine could leave with the scarf and he'd be none the wiser. Of course, he trusts her and believes that her interests also lie in the academic...but the thought does cross his mind. So he can't help but ask,

"Are you still in the room?"