Board Thread:Episode Discussion/@comment-1599757-20151212162645/@comment-25266931-20151219184301

73.Anon.52 wrote:

Given that she wields portals and gives the impression she at least has/uses other skills, maiden "magic" tends to best explain her abilities, while being a maiden herself also explains why she left Yang.

Even if she isn't a maiden herself I would wager she is at least protecting one, perhaps even a twin of Yang's(I think this is less likely than Raven herself being a maiden, but because Qrow/Raven indicate twins run in her family it is possible). I don't think she's a maiden, but with that samurai like appearence I'll go with her protecting one. Maybe the one she's assigned to is her friend. And she had to leave Yang to do it. To protect the world Yang would grow up in.