Board Thread:Naruto Discussions/@comment-25645405-20141128183407/@comment-3279282-20141201120110

Amaterasu is Blaze Release for a really simple reason: When Sasuke was trapped in Kaguya's ice, he used Amaterasu with his left eye and Kagutsuchi with his right eye. He didn't call it Blaze Release: Kagutsuchi. This was the first time he did that and it was also the first time he used Amaterasu before using Kagutsuchi. So why didn't he call it Blaze Release: Kagutsuchi this time? Because he had already released the black flames by using Amaterasu. Blaze Release - as the name suggests - is what releases the black flames and Kagutsuchi is what controls them. There was no need for a second release of the black flames in this case, since he already had them before his very eyes. Do you see where I'm coming from?