Board Thread:Theories and Speculation/@comment-29769110-20170120224723/@comment-25122992-20170122150241

As far as I know, page 117, where the space-time ability of Tobi is described, and there's the mention of Tobi escaping Itachi's Amaterasu thanks to it, and since this ability was later revealed to be Kamui, it means he survived due to Kamui.