Board Thread:Versus Debates/@comment-36006024-20180727165341/@comment-26107879-20180803003414

That's definitely how Kamui works. There's no discrepancy about that. The reason being is when Obito went to grab Naruto and Gai was hitting him in the head. If he had control over what Kamui'd he wouldn't have Kamui'ed both his hand and head. He would of phased through Gai's attack by making his head only intangible and grabbed Naruto and won the war. But his hand and head was in contact with something so they both became intangible. As for the reason why he doesn't Kamui when he's falling and making contact with the air, or why his feet don't come intangible while they're in contact with the ground, I don't know. It probably has to do with pressure. If he can be physically harmed by the pressure of an object then Kamui activates and makes that part of his body intangible. Kishimoto probably didn't think about it too much. But that's how Kamui works.