User blog comment:Miskos3/Fairy Tail 539: World Destruction, Review/@comment-4933386-20170611032819/@comment-7418318-20170611184701

The actual question is why doesn't Acnologia do that all the time, since that's exactly what he did to Jellal right before he grabbed him in his remaining claw.

Maybe he thinks that it's a boring way to win...