Something of the stiff formality leaches out of Enjolras's manner, at that instant agreement, and his face relaxes into a small smile. (Enjolras's smiles have been called dazzling; Simon may or may not find them anything of the sort. But this one does change the entire look of his fine-boned young face. The sincerity shines openly.)

Enjolras is not an uncertain man as a rule, and now is no exception. But there's a difference between coming to a stranger with an important request, and carrying on a conversation.

"Thank you. I'm in your debt."