{Author's Note: I doubt they'll ever go down this route, but if they do or are considering it, let this fanfic show you why it's stupid. If you don't like soapbox stories, this isn't for you.}
This was it. Jaune was finally gonna stop Cinder. He was gonna avenge Penny, Pyrrha, Beacon, and almost every life either hurt or lost because of this woman. He raised his sword, ready to strike down…
"STOP!" A shriek caught his attention. He turned to Ruby who gave that yelp. Cinder was way too injured to fight back and if she did try something funny, she had Nora, Ren, and Qrow to deal with… Weiss, Blake, and Yang were too busy being in other plots at the time.
"Please! Don't kill her! If you do, you'll be just like her!" This caused the group, Cinder included, to stand there, dumbfounded. It was Qrow who said the one thing going through all their minds.
"… Are you fucking kidding me right now?"
"W-what?" Ruby responded.
"Ruby, think about this for a minute. Cinder killed Pyrrha and Penny." Jaune said.
"Yeah! But we shouldn't kill her! We'll be worse than her!" Ruby replied.
"Worse than the woman who plotted the downfall of our academy, framed your sister, got our friend to murder your friend, staged a terrorist attack led by a guy who maimed your sister and your friend, killed an innocent woman to get her powers, killed Ozpin, destroyed our school, murdered our friend, destroyed the means of communicating to other Kingdoms which may or may not result in a full on war, and you're telling us we'll be as bad as her? We barely did half the things she did!" Nora said.
"Plus, we sort of already got revenge for Kuroyuri so there's really no difference between that and this." Ren said.
"But… In Kuroyuri, we killed a Grimm…" Ruby said.
"I know this sounds very stupid to say, but… wooooow that's racist." Cinder said before the edge of Jaune's sword pressed up against her neck.
"Silence." Jaune growled.
"Plus, didn't you already mutilate Cinder? And that scorpion dude?" Nora asked.
"Um… Well…"
"Look, Ruby, I know actively taking a human life is a very difficult task. There's a difference between saying you'll stop someone and actually doing it, but, look at it this way. Cinder here, she's a Maiden. Kill her, you take a valuable piece off of Salem's table and might even move the piece to our side if we're lucky. Really, any other day, I'd humor your sudden development of morality, but here, this is clearly the wrong place for morals." Qrow said. Ruby sighed.
"Fine. Fuck it." And she shot Cinder in the head.