User blog comment:Miskos3/Fairy Tail Chapter 334: Sin and Sacrifice, Review/@comment-203.215.121.116-20130608233519/@comment-7418318-20130609082927

Neither Dragon said that.

He literally said "Scissor Runner, a capture mission doesn't mean you can't break a few bones" to which Scissor Runner answers that he will "erase" every Human (Did he break from the crontroll or is he just trash talking here? I assume the latter).

To me that sounds like we are missing a few lines here that the Dragons exchanged while we saw only Sting and Rogue talk.

As for your question I have a counterquestion: How is f-Rogue supposed to force Sting into using his powers on present Rogue, so he can absorb them?

F-Rogue's real power is Dragon Manipulation Magic, which is independant from gaining Stings powers. With seven years of training it's even possible he might have defeated Natsu easily even without using the white-shadow mode, but wanted to show off a bit. "You think you are special because of dual-mode? Think again!"