User blog comment:IamThorn/Nora v.Ren & Yang v.Ruby/@comment-25436196-20140925005005

If they had to fight as a part of the tournament, then maybe. I can imagine both sides would go a little easier during the fight ( I doubt Yang would ever go "Pyrrha vs. CRDL" on Ruby), but it would still be like two brothers fighting with plastic swords. Except theirs can kill giant monsters if they want to.

But if they had to fight seriously, it would be a different story. Let's say something happened to Ruby, and she started attacking the others. I can't imagine Yang would be able to bring herself to fight Ruby for real. She'd probably remain in the defensive, and try to talk to Ruby out of it - Ruby would do the same if the situation was reversed (which is something I can actually see happening, since I think there's a chance Yang could "lose control" of her Semblance at some point). Nora vs. Ren is a little harder to say, because we don't really know a lot about Ren's personality at this point. We know he's calm, but that's it, we've never seen anything else that could maybe indicate how he'd act during a team crisis. I know that Nora would never fight him, though