User blog comment:Nightsassassin9/A Different Theory on Summer Rose./@comment-199.98.17.142-20131121001634/@comment-24143822-20131125054838

As the others have replied, I don't believe that Qrow deicded to engage Summer with the intent of killing her. He had originally planned to simply incapacitate Summer and ask where Ruby was, but overestimated his opponent and landed a killing blow instead of a wounding one.

And Qrow was not necessarily going to train Ruby. Like her parents, Qrow was going to let her decide if she wanted to be a Huntress or not on her own, rather than forcing her to face her supposed destiny like Summer was trying to do. It's kinda like in Harry Potter, where it's better for the hero to save everyone because they feel it's the right thing to do, not just because some prophecy says they have to. Not to say Summer was evil for doing what she felt she had to do, simply misguided in her attempt.