"Some of what I see here is the same I would see in London," Watson says, as he gently probes Jeff's knee with his fingers. "Sprained ankles, runny noses, though occasionally for people with ankles and noses not with quite the same anatomy I am used to. And some of it is very strange indeed. Magical illness is certainly an entirely new field for me, though I fancy I'm doing quite well at it."

He frowns a little. "Contusions and abrasions, and some swelling, but I do believe this is more damage to the soft tissues of your knee than anything else. You should stay off it for a week or so, as much as possible. We can find you a temporary crutch, if that is something you would find useful. Right now, I can clean and bandage this for you."

A pause.

"Ah, what's a 'slinky'?"