It sure isn't a full explanation for why he was staring like that, but Alice does figure that odd glow to his eyes must have something to do with it.

... or.. well, it's either that, or this is just one very, very odd person.

"Were you perhaps trying to see something that most of us can't?"

Look, at least she's being subtle while asking about that glow hanging around his eyes for a moment. For once. There's some actual effort being made here.