Board Thread:Naruto Discussions/@comment-26993711-20160319001508/@comment-26773508-20160319053926

TheOneWhoLovesNaruto wrote: In what instance are you referring too? Where is this? After Sasuke vs Itachi, when Sasuke's eye automatically used Amaterasu against Obito after he revealed his sharingan. Itachi programmed Sasuke's eyes to unleash Amaterasu on Obito.

@Sayian101: I think you're right here. Going by Obito's screams and his claims of a "secret", it seems logical to conclude that Obito used Izanagi. Kamui is Obito's trademark ability. If Konan could figure it out its mechanics, then Itachi should have figured it out too. So there's no reason to call Kamui a "secret" Itachi didn't know about.