[He remembers feeling guilt...so much guilt, that he shut himself down from his own inability to cope with it. If he hadn't had others relying on him, and the need to stay alive, and do his duty...he would have stayed shut down.]

I learned it is better to be alive, and have the chance to make a difference. What more do you think you need to do?

[Granted, his situation wasn't the same as Drift's. He'd almost killed innocents on accident, but it hadn't actually happened, and he'd never do it on purpose. He doesn't think he even could.]

I don't understand. What can't be explained?

[McCrane has too much LOGIC for this to make sense.]

..

....

It was only a theory. [He says softly, after a moment, hoping it isn't true.]