User blog comment:Miskos3/Fairy Tail Chapter 334: Sin and Sacrifice, Review/@comment-175.136.146.183-20130607133246/@comment-7418318-20130607135806

And to complete the confusion, f-Rogue would see that fight and realized that he killed Sting by accident and not intentionally to absorb his powers and that realization would bounce him back to his old self.

And suddenly the roles of f-Rogue and present Rogue are reversed, but f-Rogue, despite being strong, can't just kill his old self, since that would be like comitting suicide.