Voldemort would know he had Potter, and he had moments to act. Taking Granger's wand, he raced down the hall, leaving the bodies in the entrance hall, removing wards as he ran. He located the box he was after in moments, tearing back the way he came. Placing the box on the floor, he pointed the wand at its owner and said, "Renervate." before dropping it into her lap. As Granger came to, he bent over Goyle, fussing over the stupified figure.