Board Thread:Speculation House/@comment-14138255-20140701202255/@comment-4830106-20140820005049

Well, there's still that whole snarl of whether or not and to what degree they're blood-related, and even if they were full sisters, Ruby just might not have gotten the right genes.

That aside, she's probably decent at it, since I imagine Yang would probably want to teach her, but I imagine its not really what Ruby would consider as part of her arsenal.