Me.
I was also hoping that Hermione would develop a potion to cure werewolfs. (Obviously you need the hair of the dog that bit you)...
Which reminds me... did Grayback actually bite Lavendar Brown? I could not tell, from re-reading the sentence, if he was intercepted on his way to attack her or if actually he had bitten her. Not that I was that worried about Lavendar. My fear all along had been one of the Weasley twins-- they were among my favorite characters.