Reading Martin's body language is something that John has become rather adept at over the past few years — a skill that he is grateful for even (especially) when presented with as miserable a proverbial paragraph as this one. The way Martin tugs up the blanket as if to submerge himself but makes no suggestion of a move towards John tells him that he was right to keep his hands to himself for the moment: Martin does not want to be touched. His flushed skin and the arm flung over his face suggest an unusual degree of embarrassment. And the way the aforementioned blanket-tugging incidentally highlights one specific aspect of the state Martin is in gives John a plausible explanation for why the poor man might be more mortified than usual.

Perhaps it would be best to just... give him a moment. Not that John has any intention of just wandering off sans explanation. He clears his throat quietly, then offers, "Can I, er, get you some water?"