User blog comment:IamJakuhoRaikoben/Chapter 503: The Last Sight Seen, Review./@comment-7418318-20160928235211/@comment-1359322-20160929080139

@Nick, true, but i think those flames would be a pretty good excuse for why Natsu can move inside Age Seal too. We already seen before that Natsu can burn off magic with his regular Dragon flames, just placing an application of that using the black flames.