I enjoyed seeing Charlie's growth as a character and I also enjoyed the tie in with him singing in the rain "Save me" before he helped that woman in distress. In Desmond's flashback, didn't he see Charlie singing in the rain, which triggered his flashes about Charlie. I found it interesting that Charlie is singing about someone saving him, when he is the one that ends up saving the woman in the alley and he is the one that wants to do whats right to "save" Claire and Aaron and get them rescue.

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Because all we really need to survive is one person who truly loves us. And you have her.