Hmm. Well, I must say, if that's what Carrow did (and I certainly wouldn't put it past him either) then the boy's reaction makes sense. I forgot, last night was the full moon, wasn't it, so that's why Lupin was in the infirmary. But the boy might not have realised that was the reason Lupin was there. I mean, think about it: if Carrow injured Terry Boot, all the while telling him it was because he was being bad, and then he woke up in the hospital wing and Lupin was right there beside him in the next bed . . . well, the poor boy might have thought Carrow sent him to make good his threat.

No wonder he panicked so badly then.