Percy made a face. "We don't exactly have time for this," he said, "but better than not, I suppose. Really quick - wand like so," he demonstrated, "wrist flick thus, and Protego!" It was not the best shield - Percy's wavered - but it did exist. Edward Greengrass (now reportedly an Unspeakable - it was widely agreed that the entire student body had been Obliviated when he left, because no one could remember what had happened) had been a decent instructor. "Go ahead and try," he said, "and be ready to run."