Someone screamed, a thin, high noise like piano wire snapping. A yell of triumph. That broke the dam, and then there was another war-whoop, another cry, and then a burst of applause. Hermione staggered backwards, white as a sheet, suddenly certain she was going to collapse. What had happened? Had she stepped into some alternate dimension? Her eyes rolled backwards and she heaved dryly, thick and nauseous. 