Between clanks, Combeferre hears the door open, the quiet rustle of hat and coats being removed, the soft sound of a chair as someone falls into it.

The boiler will do its work without Combeferre's supervision. He tidies up the bathroom to make it manageable, and then comes out. Enjolras is folded up in the chair, head in his hands.

In three quick steps, Combeferre is at Enjolras's side. He drags the other chair over so it's closer, and sits, taking Enjolras's hand in his. "What's wrong?"

It's extremely obvious that something is. But there is more than one possibility of what that might be.