User blog comment:Miskos3/Fairy Tail 520: Dragon or Demon, Review/@comment-24102956-20170204101737/@comment-21119641-20170204132212

Technically, Mashima forgot that Gajeel said "I'm turning into the particles", going to the Underworld simply means dying. That or Gajeel was simply lying so Levy didn't come for him, either way, he was teleported before he faded...even though the light came after he faded.