Board Thread:Episode Discussions/@comment-25319479-20160818105554/@comment-25122992-20160821175423

Elveonora wrote: Why didn't Obito make himself intangible? Emm... probably because the bone would phase through him and hit Naruto instead? I thought that not allowing to hit him is the entire point of Obito standing in the way of attack.

Also, Obito can't make himself intangible and teleport objects with Kamui at the same time. So in this case he wouldn't be able to save Kakashi from the bone aimed at him as well.