"Good to know there's some constants in the universe-- or, uh, universes?" he remarks lightly, with a teasing little smile. Though however much it might sound like he's joking, there's a sincerity there. It is an odd comfort to know that no matter where they are, no matter how many... issues this place has when it comes to mortality and demons and shit, bodies are bodies, prone to the same common aches and sniffles.

There's some discomfort at the probing, however gentle, which only serves to remind Jeff of the fact that this is indeed an issue he can't just ignore. Stupid tender knee... Worse, though, is the suggested treatment: taking it easy. That might as well be a death sentence, with how high strung Jeff tends to be. At least he can distract himself with cultural exchange via slinkies--

"Oh! It's a toy, like-- this sort of..." He tries to make a gesture that embodies the concept of 'slinky', which mostly ends up looking like he's cupping and jiggling some invisible breasts in his hands. "...long, coiled spring? It's suuuuper bendy and flexible, so you can make it do tricks, like walking! And walking down stairs! And... probably other things." It's gotta do more than walk, right? "Hey, so... I can probably get by without a crutch, I think. And I can still go for walks, right? Or like, a light... gentle... totally brief jog...? I can't be outdone by a slinky, dude." Wait, you don't call a doctor 'dude.' "Doc."