Flapping Chidori

Sasuke forces his use of a third Chidori,probably by using the power of the Cursed Seal of Heaven, making it 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, but it is improbable since the voice started to come before Sasuke even took flight or the wings started to flap.

Now that Sasuke no longer possesses the Cursed Seal it is presumed that he can no longer use this technique.