I shot a kid. He was 13 years old. Ohhh, it was dark, I couldn't see him. He had a ray gun, looked real enough. You know, when you're a rookie, they can teach you everything about bein' a cop except how to live with a mistake. Anyway, I just couldn't bring myself to draw my gun on anybody again.
McClane recognizes Powell's ability at police work and asks why he's not on the street anymore. Powell answers. McClane apologizes.