Board Thread:Theories and Speculation/@comment-33486170-20171124080415/@comment-31099706-20171201084627

I believe the flame's complete heat goes towards the object it hits rather than spread heat, in the same degree of the sun.

Since the objective of it all, was to burn/kill/destroy it's targets, not anything or anyone else, that is intentionally.So I think only the targets(that is if they were living beings) experience the heat of the sun through the flames that they have physical contact with.

Though even without physical contact, the flames produce high amount of heat, more than normal flames but very less than the sun.

If you think about it that might explain alot.For starters, I think it's safe to say, that the user doesn't get burned or harmed by the flames(or maybe they do, but that's not the point). If the heat of the black flames are as dangerous as the sun's, then even the user would be subjected to that heat.And considering how powerful it is said to be, it'll backfire him in battle(pun intended).So it be like one of the worst jutsus to use, if it actually creates that much heat, people could consider it even worse than Rasenshuriken(before sage mode came) for the user himself.

So I believe, since it's literally powerfull magical/unnatural flames created through magical eyes, I think it's safe to say that the flames are user friendly and are different in nature to real flames(I'm talking about what I just showed), that is they don't emit heat in comparision to the temperature they posses.They only release that heat through physical contact upon it's targets.Thus, being a more pratically safer jutsu.

Now, some might consider the heat of the flame as not compared to the heat of the sun(which was said to be), I think it easily neuterlising, the eight tails, was proof of it.The Eight tails easily could take on normal flames I believe and it took on other kind of large blasts and such.How could it then, be easily defeated by the heat of the Amaterasu, if it wasn't the heat of the sun?

The only people who can tell the truth are Naruto(getting shot on his face for a few seconds), Bee, A(yes he took it easily, but he also took his hand that easily as well, the man has too high of a threshold)Oro(probably) Karin and other people I can't remember.Well these are all my own honest opinions.