User blog comment:EvanDude345rv5/Fairy Tail Chapter 359 Review: Fairies vs Hades/@comment-5681812-20131109202943/@comment-1359322-20131114015916

The roar of the power shown could be a one-time thing due to a burst or sudden increase in power. Remember Gajeel's breath attack when fighting Rogue in his Iron Shadow mode was shown to be nearly the same as Natsu's one when fighting Hades, yeah i know Natsu was weaker 7 years ago and being able to have the same output might be just to show off Natsu's innate power or rather raw destructive power.