Bruce sinks down into the bath and Clark goes and sits next to it, hooking an elbow at the edge, in his neat clothes and glasses. He would probably be more impressed by this display if he had a real clue at just how stunningly uncomfortable and deadly extreme cold can be, but it's impressive nonetheless, fascinated by the effort going into a meditative heart rate, slow breathing.

Well. The potential problem with jelly is more the possible presence of gelatin and other stabilising agents, but, Clark offers the box. "That one," he indicates. "And this one's pumpkin spice and cinnamon. Maple glaze, uhh, that one's the filled hazelnut and chocolate. Baked apple, raspberry and coconut. If you didn't know they were vegan, you wouldn't," slightly chiding.

He will let Bruce pick first, if he is in the mood to eat while bathing in ice. Clark glances across the pebbled surface of floating cubes, makes a concerted effort not to look concerned as he says, "How long does this go for?"