User blog comment:LastationLover5000/Fairy Tail 371 - In Which Hiro Should Just Quit Out of Shame (Tartaros Arc: Part 2 - Song of the Heavenly Dragon)/@comment-25316424-20140214223453/@comment-10554972-20140215190918

Well if you recall, Elfman went psycho when he first used his Full body Take Over. It must actually turn you into the creature that you used the spell on and you need to be stronger mentally than it in order to control it.