Glove Lady?
Up ahead, Malfoy had already launched into an endless explanation of the essentials of the waltz:
"There are two kinds of waltz, fast and slow. The basic footwork is one step per beat, three steps to a three-beat measure, though certain special steps involve taking two or four steps per measure.
"But we don't need any special steps here. We just need to stick to the most basic ones. There isn't enough time.
"If we can get you through one dance properly in the time we have, that'll be good enough."
Zhang Xiao considered it, then walked toward Glove Lady. As he moved, ripples gradually spread across the floor.
Before the others' eyes, Zhang's figure grew fainter and fainter, until he mysteriously vanished altogether.
"Where's Zhang?"
The young wizards exchanged bewildered looks and rubbed their eyes. Neville said thoughtfully:
"Have you forgotten? Zhang brought us here. Maybe this place has a lot of secrets.
"You know what Zhang's like. If he could tell us, he would have done so already.
"I reckon it's some secret he can't talk about."
The young wizards thought that made perfect sense, so they put the matter aside and continued listening attentively as Professor Malfoy explained the essentials of the waltz.
As Zhang Xiao walked forward, his surroundings changed as well. By the time he approached Glove Lady, he found himself in the screening room.
"What are you doing?" Glove Lady's gentle voice rang out, tinged with curiosity.
"A ball-the Yule Ball. We're listening to Malfoy's lesson. He's the only one who's been taught this sort of thing."
Zhang Xiao pointed at the others and smiled as he spoke. He had no idea how Glove Lady managed it, but when they turned to look, the wall miraculously became transparent, as though it