“C-Cushioning Charm,” Hermione spluttered, as Ron pulled her to her feet, but to
Harry’s horror he saw that she was no longer Bellatrix; instead she stood there in
overlarge robes, sopping wet and completely herself; Ron was red-haired and beardless
again. They were realizing it as they looked at each other, feeling their own faces.
“The Thief’s Downfall!” said Griphook, clambering to his feet and looking back
the deluge onto the tracks, which, Harry knew now, had been more than water. “It washes
away all enchantment, all magical concealment! They know there are imposers in
Gringotts, they have set off defenses against us!”