Suddenly, black blinding smoke exploded from its centre. The smoke was quickly followed by something else that bubbled and roiled into the air like some grotesque butterfly emerging from its cocoon. Harry’s heart sank at the figure that stood in front of him, and he couldn’t blame Draco when he hesitated for a second time, his eyes flashing with horror, his mouth falling open, and his grip around the fang slackening. Harry saw Draco’s Adam’s apple bob, just as he felt the wound at his neck begin to burn.