User blog comment:Miskos3/Fairy Tail Episode 261: Tartaros arc: The Absolute Demon, Review/@comment-27247962-20151128091423/@comment-24102956-20151128132709

They never knew they've been fighting their own Guild Master all this time and maybe E.N.D. had a much more unique and indistinguishable appearance compared to Natsu's as if they're both completely different persons.