Board Thread:Versus Debates/@comment-36006024-20180727165341/@comment-9782468-20180803024801

My theory;

Rasenshuriken is chakra based wind and therefore passed through him.

Obito doesn't simply fall through the ground while intangible because he can do what all ninja can; stand on surfaces using chakra. He probably just stands on the ground while intangible the same way he stands on water.