My dear, I'm afraid I'm not going to be able to come this afternoon, after all. The hospital wing is suddenly Hogwarts' most popular destination.

I've two casualties of the new sparring course and another pair of young idiots who've bloodied one another with fisticuffs. And, of course, the first pair were practising curses that are not at all simple to reverse.

Do apologise to Sirius and the others, will you?