User blog comment:Miskos3/Fairy Tail Chapter 334: Sin and Sacrifice, Review/@comment-203.215.121.116-20130608233519/@comment-203.215.121.93-20130609100040

1 + 1 = 2

Sting must not be killed by Scissor Runner because he is important to Future Rogue. some time in the future, Rogue will kill Sting for his powers.

so, the capture mission Revire is talking about is the capture of Sting so he won't die in the present time. Only to capture him, maybe to incapacitate him.