User blog comment:FairyRaven/Fairy Tail Chapter 409: Wedges of Black and White, Review and Commentary/@comment-1359322-20141117110653/@comment-7418318-20141117110943

We've often seen Natsu start out with being ineffective against an enemy and then somehow adapt to fight them. It started with the fight against Erigor, then Totomaru and many more. The most notable ones are probably against Zancrow and then against the Twin Dragons, where he and Gajeel even outright say that they got used to the Twin Dragon's habits or somesuch.

This isn't much different than all those.