Board Thread:Versus Debates/@comment-26636534-20170822151908/@comment-5085906-20170826122441

@Ravenlot27

Well, when Itachi hit him in the Kamui dimension, he could feel the pain in our dimension meaning whatever body part he phases into Kamui has a sort of connection to our dimension. At the same time, when he phased his upper torso and head against Fu, he could still perceive the environment around him even though his head should have been in Kamui at that point. So, by barely picking up some of these clues, then I guess in both of them, somehow?

Besides, I'm pretty sure Obito's head was still visible when Fu tried to perform Shintenshin.