She turns back towards him and he sees the tears, hears the strain in her voice, and suddenly his stomach turns icy and starts to plummet into his feet.

Is this panic? It might be panic. Whatever it is, it drives him towards her, strips away any attempt he might have made at being charming.

"Molly--oh god, what did I do?"

It's always his fault; he knows that from experience. It's not often that he wants to make it right. There are very few people in the world who can get that out of him, and Molly Hooper has been working her way to the top of that list for years.