User blog comment:Miskos3/Fairy Tail 520: Dragon or Demon, Review/@comment-29874610-20170204151505/@comment-5303512-20170204215418

That does not explain why Natsu could enter the temple without being repelled? Inert or not. Because like the Dragon Seal, it should not be immaterial since it effects one's physiology, besides, Prlyusica and Wendy have been looking over Natsu several times in the series, obviously they would have detected something out of the ordinary by then.