User blog comment:IamJakuhoRaikoben/Chapter 503: The Last Sight Seen, Review./@comment-24277053-20160926135212/@comment-7418318-20160929071257

I wonder if Lucy will ask Happy about this in one of the coming chapters.

Considering that Happy is pretty much always with Natsu, he'd be the natural go-to man... erm cat to ask if it's true.

I doubt that Lucy is as stupid as Gray and just believes that Natsu is E.N.D. without a doubt just because an enemy said so.