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.
No. He moved to attack her, but didn't actually bite her, but I Later, during the battle, he was blasted by Ron and Hermione.