Thread:DazzlingEmerald/@comment-25152698-20141211170148/@comment-4961229-20141211172327

Kamui happens at the speed of thought with the double mangekyou. Obito sure as hell can execute Kamui anytime anywhere faster than Itachi can cast Ephemeral. He had to build chakra and do hand signs in order to cast it. The dust crow genjutsu was faster than that. I don't even see why you brought that up. Jutsu activation is jutsu activation. The discrepancy most often comes in with the level of chakra needed to execute the jutsu. Itachi's fastest genjutsu is the regular Sharingan genjutsu because it requires very little chakra to pull off. I'm not sure which character you're talking about, but if she has the double mangekyou and the needed chakra, she can operate on Kaguya level speeds that only a handful have ever operated on. Both Obito and Kakashi have demonstrated this definitively.