Board Thread:Theories and Speculation/@comment-6769189-20150307180344/@comment-25283946-20150310155950

Elveonora wrote: I'd suggest reading this, it's quite outdated since the user has been absent for the most part, but it goes into detail about the stuff mentioned above. Exactly... [quote GoDai] Blaze Release (Clarification & Theories) Sasuke Uchiha has used a technique known as Blaze Release: Kagutsuchi, which allows him to manipulate the black flames of Amaterasu. This ability is used through his right eye (whereas Amaterasu itself is cast with his left). There are three possibilities for this nature:

1. Sasuke was only boasting, comparing his ability to an actual nature. (Highly unlikely, as this makes the "~ton" suffix a "coincidence") 2. This nature is a combination of Fire and Yin, applying the form aspect of Yin to the flames of Amaterasu. This would make sense in the fact that Sasuke and Itachi both have control over Amaterasu(Fire) and Tsukuyomi(Yin) in one eye each, and therefore the casting of Amaterasu(Fire) and the form manipulation(Yin) may be what is being combined to form this nature. However, it is strange that only his right eye is needed for the actual technique. Also, the Uchiha have connections to the Fire and Yin natures, possibly meaning they can be combined in this way. (More likely, as the kanji for "Blaze" (炎) is two kanji for "Fire" (火), one on top of another, making the inclusion of another natural element unlikely. However, adding Yin or Yang to modify the flames while leaving them purely fire-based would make more sense.) 3. This nature is a combination of Fire and Lightning. Fire is modified to move and behave like Lightning, forming forks and Lightning Chakra Flow-like auras. It just happened so that Sasuke was using the flames of Amaterasu for this, although he can utilize other existing flames. (Viable, although a bit unlikey) -Also, the flames of Amaterasu are as hot as the flames of the sun, meaning they are composed of ionized plasma. The Lightning may be what is being used to change the shape of the charged particles, forming spikes, or forks. -Sasuke was able to learn the two natures pretty quickly, making it possible that he has affinities for both. Kakashi once said Sasuke was the same type as him, leading to his learning of the Chidori.