I was a-- [Not a Cylon, not really.] --a robot. I switched with David. It wasn't... he's very primitive compared to the ones we know. Somewhere between being a skinjob and a chromejob.

[He's staring down at his hands, now, because he doesn't want to see the look on her face.] And I ran... simulations in my brain, because I could. How things could have been different. How they would have changed. Where the clues I missed were.