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The smoke began to clear. "Now's your chance, boy! Go!" The voice hissed. But before he could do more than think of scrambling away, Harry involuntarily froze at the sound of heavy footsteps and a disturbing chattering sound. Previously muffled by the strangely dense smoke, the chattering was now nearly deafening. "Oh fuck," Harry and the voice said in tandem. Harry would find amusement in the voice's uncharacteristic cursing on any other day. On this day, however, Harry wasn't quite capable of feeling amused. Blinding terror? Yes. Amusement? No.
"Oh fuck, oh fuck, bloody buggering FUCK," he whispered, frantically looking for a hiding spot. The smoke dissipating had seemed like a miracle before. Now it was more Potter Luck. Survive by the skin of his teeth or get fucked over. Fairly often a mix of both, but he wasn't sure he'd get out of this one.
Finally, they saw the creature in all its (dreadful) glory. "What the hell is that thing?" Harry whispered. The voice was silent for a moment before responding despondently, "That would be a Gashadokuro...I have no idea why it's here, of all places. Don't bother with your wand." The skeleton must have been at least 9 meters tall, missing all flesh and organs but for its eyes. Said eyes were trained on Harry, burning with malice. It twitched. Harry was running before he even realized he was going to move. "At least now we know what killed all those people," he shouted. The voice didn't reply, probably frantically thinking of a way out. If Harry died, it died as well.
The booming footsteps behind him were too close for comfort, and he ducked just in time to avoid losing his head to a massive hand. Harry stumbled and then put on a burst of speed, but knew the thing wasn't even running. Large enough to keep up at a walking pace. Hopefully, it couldn't run, but he wouldn't bet on it. Crashes sounded as it kicked abandoned cars out of its way, and Harry shrieked as an upside-down truck slid by. His only hope was getting to where the anti-apparition ward ended, but 1. He had no idea where that was, and 2. the Gashadokuro was gaining on him. There was nowhere to go, as all buildings had been turned to rubble, presumably by the monster. Frankly, he wouldn't want to be trapped in one anyway.
"Harry, let me take over. You know I can fly without a broom," the voice said urgently. Panting, Harry snapped, "There's no bloody way. You'd never let it go!" "You idiot boy, there's no other choice! I'll give control back! Let me through! We'll get crushed to a bloody, headless pulp!" The voice never yelled anymore, which surprised him enough to slow down.
That was a mistake. The Gashadokuro's hand smacked him to the side like he was a fly. Harry's vision went dark at the same time his right arm and ribs snapped like twigs. The pain was nauseating. He may have screamed. "Harry, for Merlin's sake, give me fucking control!" The voice screamed. Hell. Might as well. Couldn't be worse than this.
Harry closed his eyes and dropped the iron walls between them. Feeling Voldemort slither in, shunting his consciousness to the back of their brain. "You better release it...after this."