User blog comment:IamJakuhoRaikoben/Chapter 394: Juvia vs. Keith, Review./@comment-4938779-20140725133659/@comment-7418318-20140725134031

If END is able to eat Dragon Flames it would certainly make a victory hard or impossible for Igneel. But with his dual elemental mode Natsu might still stand a chance. Maybe fusing the flames with lightning will prevent END from eating them.