Board Thread:Naruto Discussions/@comment-26993711-20160319001508/@comment-26773508-20160319132830

Thekillman wrote: Can't he use Kamui to phase away only his body, and not the flames?

Itachi must've figured out the teleportation part of Kamui, but did obito show him the phasing part? I don't think we've ever seen Obito phasing through an attack after the said attack made physical contact with his body. This is nicely illustrated when that Aburame bodyguard of Danzo infected Obito's right arm with his nanovirus. Had Obito possessed the ability to remove the infection by phasing the virus away, he would have done so. Instead he just cut off his arm and replaced it with another one. The only way Obito could phase away from the virus would be before the virus made contact with his flesh, i.e. when the Aburame guy was lunging towards Obito but had not yet made physical contact.

The same thing seems to apply to the Amaterasu incident. Obito's body had already come into contact with the black flames. There probably was no way he could phase through it, since Obito hasn't shown any of that feat in the manga so far. So the two options are Izanagi or replacement of his body part with magic Hashi cells. But considering the fact that Obito appeared in one piece without any signs of amputation so quickly, the only explanation that fits is Izanagi.