Harry, abruptly and unexpectedly, punched the open door with full force, as a torrent of frightful anger burst free from him as this memory stirred. Hermione felt it prickle over her skin in dark waves, as she leapt back in startled shock and surprise at Harry’s sudden eruption. She was desperate to go to him, to soothe him. But he was visibly shaking with rage and she felt she should wait it out a moment.