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!"
Harry saw Hermione checking that she still had the beaded bag, and hurriedly thrust his own hand under his jacket to make sure he had not lost the Invisibility CloakThen he turned to see Bogrod shaking his head in bewilderment: The Thief's Downfall seemed to have lifted his Imperius Curse
"We need him," said Griphook, "we cannot enter the vault without a Gringott's goblinAnd we need the clankers!"
"\iImperio!\i" Harry said again; his voice echoed through the stone passage as he felt again the sense of heady control that flowed from brain to wandBogrod submitted once more to his will, his befuddled expression changing to one of polite indifference, as Ron hurried to pick up the leather bag of metal tools
"Harry, I think I can hear people coming!" said Hermione, and she pointed Bellatrix's wand at the waterfall and cried, "\iProtego!\i" They saw the Shield Charm break the flow of enchanted water as it flew up the passageway
"Good thinking," said Harry"Lead the way, Griphook!"
"How are we going to get out again?" Ron asked as they hurried on foot dolce