Board Thread:Theories and Speculation/@comment-26107879-20160222005417/@comment-734582-20160226082714

Georgio722 wrote: Maybe the Life/Death part of the Rinne Sharingan is the ability of immortality? Hence why Momoshiki can be killed even with the fruit's power. She was immortal because of the combination of the Juubi (Madara already showed nigh-immortality), and because of her Spacetime ability. Obito showed that the Afterlife is just another world accessible by Spacetime ninjutsu (well technically Orochimaru showed it too, with Edo tensei). If Kaguya dies, she simply uses Rinne Sharingan to return to our world.