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Amy Pond is a lot like my sister. We grew up in adjoining rooms and yeah, she never came into my room, but I never entered hers either. Some sisters don't have a great relationship.
But like any younger sister (Amy has memories that precede my knowledge of my existence, therefore she must be older) I feel that she gets to do all the fun things in life. I'm not going to stand for that.
Amy's raggedy doctor came back for her, and she is content to let him take her away from everything she's built. She's content to leave me behind without even saying goodbye.
Now I'm just a crack between dimensions so I'm not exactly one for building things, but I can respect what my older sister has managed with her life. I don't want Amy to throw that away.
I have the power to make sure she doesn't leave me behind and, at the same time, keep an eye on her, so I will.
Amy might be a poor excuse for an older sister but that doesn't mean I have to be a bad younger one.