User blog comment:Nightsassassin9/A Different Theory on Summer Rose./@comment-11188061-20131120085953

I didn't have a choice: I did what I had to do.

I made a sacrifice, but forced a bigger sacrifice on you

This is the part where your story won't fit with the lyrics. A sacrifice is something you do out of your own choice, and when you do it you expect to get something in return. Unless I've greatly misinterpreted Summer's psych, I find it very hard to believe that dying on Qrow's weapon was the sacrifice she wanted to make.

It's far simpler and logical to assume that Summer Rose was set on an important mission that may help achieve whatever objective she's trying to do. She believes that she is strong enough to do it without dying.

However, at some point of the journey she was ambushed by unexpected circumstances, resulting in her being unable to perform her responsibility either because she sustained serious injuries (most likely), or was obstructed by enemies, or both. Between achieving her objective and seeing Ruby again, she chose to achieve her objective because the latter would result in extremely terrible consequences, and even if she gets to see Ruby again the world she lived in would very likely be hell. Hence she made the choice to ignore her injuries, pushed her Semblance beyond the limits (note Monty's talk at Australia about the human spirit having no true limits) and ultimately prevented the worst of consequences of happening, at the cost of her life.

Her sacrifice was likely just a stop gap too, considering that it was foreshadowed repeatedly that the current peace in RWBY would be shattered to pieces.