"We must be miles under the school," said Harry, his voice echoing in the black tunnel.
"Under the lake, probably," said Ron, squinting around at the dark, slimy walls.
"Lumos!" Harry muttered to his wand and it lit again. "C'mon," he said to Ron and Lockhart, and off they went, their footsteps slapping loudly on the wet floor.
The tunnel was so dark that they could only see a little distance ahead. Their shadows on the wet walls looked monstrous in the wandlight.
"Remember," Harry said quietly as they walked cautiously forward, "any sign of movement, close your eyes right away..."
"Harry — there's something up there —" said Ron hoarsely, grabbing Harry's shoulder.
They froze, watching. Harry could just see the outline of something huge and curved, lying right across the tunnel. It wasn't moving.
"Maybe it's asleep," he breathed, glancing back at the other two. Lockhart's hands were pressed over his eyes. Harry turned back to look at the thing, his heart beating so fast it hurt.
Very slowly, his eyes as narrow as he could make them and still see, Harry edged forward, his wand held high. The light slid over a gigantic snakeskin, of a vivid, poisonous green, lying curled and empty across the tunnel floor. The creature that had shed it must have been twenty feet long at least.
"Blimey," both Memory Ron and the entire Weasley Clan said weakly.
There was a sudden movement behind them. Gilderoy Lockhart's knees had given way.
"Get up," said Ron sharply, pointing his wand at Lockhart.
Lockhart got to his feet and dived at Ron, knocking him to the ground. Harry jumped forward, but too late — Lockhart was straightening up, panting, Ron's wand in his hand and a gleaming smile back on his face.
"The adventure ends here, boys!" he said. "I shall take a bit of this skin back up to the school, tell them I was too late to save the girl, and that you two tragically lost your minds at the sight of her mangled body — say good-bye to your memories!"
He raised Ron's Spellotaped wand high over his head and yelled, "Obliviate!"
The wand exploded with the force of a small bomb. Harry flung his arms over his head and ran, slipping over the coils of snakeskin, out of the way of great chunks of tunnel ceiling that were thundering to the floor. Next moment, he was standing alone, gazing at a solid wall of broken rock.
"Ron!" he shouted. "Are you okay? Ron!"
"I'm here!" came Ron's muffled voice from behind the rockfall. "I'm okay — this git's not, though — he got blasted by the wand —"
There was a dull thud and a loud "ow!" It sounded as though Ron had just kicked Lockhart in the shins.
"That asshole. I was wondering what had happened to him," Cho said with obvious disgust in her voice.
"What now?" Ron's voice said, sounding desperate. "We can't get through — it'll take ages..."
Harry looked up at the tunnel ceiling. Huge cracks had appeared in it.
"Wait there," he called to Ron. "Wait with Lockhart. I'll go on...If I'm not back in an hour..."
There was a very pregnant pause, "I'll try and shift some of this rock," said Ron, who seemed to be trying to keep his voice steady. "So you can — can get back through. And, Harry —"

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Memory's Prisoner
FanfictionUmbridge crashes one of the DA meetings with her Inquisitorial Squad. A misused spell sends everyone in the room into Harry Potter's memories.
Chapter 9: The Chamber
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