Rory looked at her, his voice almost toneless. "I was turned into an Auton. And while an Auton I shot and killed Amy because I wasn't strong enough to resist the Nestene Consciousness indefinitely and Amy wouldn't run when I told her to. We managed to reverse that bit of history. But don't tell me it never happened. I was there. She died in my arms after trusting me to be strong enough not to shoot."