Well, that's not good. That's a lot of things really, but good is not one of them. Between the confusion from the mysteriously vanishing bruises and the panic from the fact that Joss is coughing, there's only one coherent thought in Reigen's head.

Oh, fuck.

"Hold on, I'll get you some water--eh? Flask? What?" Reigen has no clue why the kid is asking for a drink when he's dying (why would you even have alcohol on you, Joscelin?!), but he goes to look through where they discarded the stained clothes for something like a flask. Who knows, it could just have water or medicine in it.