User blog comment:Miskos3/Fairy Tail 539: World Destruction, Review/@comment-26184007-20170610204900/@comment-7418318-20170610210410

If they fight his Human form, he doesn't have the protection from Dragon scales, so he should be at least vulnerable to physical attacks if nothing else.

Though I think the rules inside this... whatever they are in won't be the same as those in reality, so anything can happen.