Enjolras doesn't really need the hot wine, and won't have more than a small glass of it probably. But he does accept that one glass, to be sociable, and it is pleasant to sit in company with your hands warmed by a hot drink.

"Clarifying of the mind," he asks, just to check, "or of the enjoyability of jumping into icy water?"

He's prepared to believe either! But... like... just checking, man.