While Naruto manages to reason with Sora, Sora touches Naruto and their chakra resonates. This makes Naruto turn into a partial beast. Yamato tells Sakura that he cannot control Naruto and he himself must fight against the 9 tails mentally. Sora regains his own consciousness and manages to resist against the demonic power. (Source: Wikipedia) Twelve Guardian Ninja arc: (17/18)

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