Harry sprang toward the flame door, but Voldemort screamed "SEIZE HIM!" and the next second, Harry felt Quirrell's hand close on his wrist. At once, a needle-sharp pain seared across Harry's scar; his head felt as though it was about to split in two; he yelled, struggling with all his might, and to his surprise, Quirrell let go of him. The pain in his head lessened -- he looked around wildly to see where Quirrell had gone, and saw him hunched in pain, looking at his fingers -- they were blistering before his eyes. (Harry Potter)

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Which one does his indicate, Harry or Quirrell?