User blog comment:Miskos3/Fairy Tail 520: Dragon or Demon, Review/@comment-29874610-20170204151505/@comment-7418318-20170205010957

The temple allowed for Deliora to be carried inside just fine.

We don't know how or why, but that Deliora was brought into the temple is a fact.

Now that can mean one of several things:
 * 1) The protection only affects natural-born Demons, but not artificially created ones like Etherious. This would also rule out Natsu/E.N.D. since Etherious is even in his very name.
 * 2) The protection does only work on active Demons, but not those unconscious. If the seed was dormant at the time, this would fit fine.
 * 3) The protection, rather than being any physical barrier or teleportation, messes with the brain of the Demons by either hypnotising them or by casting an illusion over their senses or similar effects and only works on the brain of Demons. Deliora being unable to move and being carried would obviously not be warded off this way and neither would Natsu who had a Human brain.

Whichever of those options is the truth we can't tell, but they all fit the facts nicely.