Board Thread:General Discussion/@comment-87.102.2.235-20160720090052/@comment-5430952-20160720205717

I doubt Raven actually killed Summer, more likely she saw her die and possibly comforted her in her final moments, based on this thread here.  And since she knew Ozpin had essentially sent Summer to her death, she decided she wanted nothing more to do with him. Hence why she has remained "off the grid." Though I could see her targeting Ruby in Volume 4 or 5, warning her if she continued on her current path, she would die as Summer did.

So I can't see her being the reason there would be eventual conflict between Ruby and Yang, I'm expecting it for far different reasons. More like, Yang finally comes back into action to save her little sister from a really bad bind. Though instead of thanking her, Ruby gives her something along the lines of "Who the hell asked you to come save me?  I was fine on my own!" Which leads to a huge verbal battle between the sisters. Yang is sorely tempted to slug Ruby for being so impetuous, but uses the FMA approach instead. "You think you're freakin' invincible?!" she snaps, then reveals her cybernetic arm, which horrifies Ruby to no end. "So did I." And Ruby cannot refute her, for the evidence is right before her eyes. "I lost my arm being reckless, like HELL do I want this happening to you!"

Back on topic, I'd say it was Salem who killed Summer Rose, hence why she never returned. Even worse, I'm expecting Salem to have Ruby fight a zombified Summer, who tries to stop her daughter's "foolishness," citing she should always listen to her mother. That would definitely show how evil Salem is, and make for the most heart-wrenching fight in Ruby's life. But we'll see.