[She keeps her hand lightly on his, and her voice is a sad murmur]

I know. The Doctor... he destroyed his own people in order to prevent the enslavement of the universe. I destroyed an entire species to save my own. The right thing... it isn't always easy. It isn't always pretty. And we get it wrong sometimes. Ask me about how I almost destroyed the universe sometime...

But we keep trying, we answer for our mistakes, and hopefully learn from them.

[She smiled at his reaction to Jack]

Do you know how I first met Jack?