I'd never have expected it, but Luna Lovegood solved the problem. Both Harry and I were covered with Grawp's blood, and that smell had attracted some of Hagrid's pets---thestrals, the invisible winged horses that draw the Hogwarts carriages. At first, only two of them showed up, and I could see the relief in Harry's eyes as he began to plan for him and Ron to go, leaving me behind with the comedy-relief troupe. It was too bad for him that Luna could see thestrals, too, and she pointed out that more were coming.