By using the power of the Cursed Seal of Heaven, Sasuke forces his use of a third Chidori, which becomes much stronger than its standard form. While Kakashi Hatake taught Sasuke that the Chidori is a blade that protects the bonds he made with his comrades, Sasuke warps it into a blade that severs them. The Flapping Chidori glows black and instead of giving off the sound of birds chirping, which the Chidori was known for, it gives off the sound of many birds taking flight. The sound of birds taking off may come from the wings on Sasuke's back while in second form.
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