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He tried not to think about her too much. She was an echo. But an echo is powerful. An echo can start an avalanche if it's loud enough.

It was a year ago today, at least by his internal reckoning. Difficult to keep track given his lifestyle.

She had been so young. Her life was measured in hours. Not days. Not weeks. Not years. Biologically she may have been older, but not really. She had barely begun to live. Barely been free of what the machine had inculcated in her.

The Doctor's lips twitch in a fleeting smile as he remembers the short time he had with Jenny. How she had loved the running just as much as he did. How proud he was when she realized she didn't have to kill. He closes his eyes, calling up the sound of her two hearts. Just like his, but so different.

Yes, she had been an echo, but she had been his echo.