(Walter draws his gun and cocks it.)

DOCTOR: How old are you?

WALTER: Nearly nineteen.

(The Doctor is slowly walking forward.)

DOCTOR: That's eighteen, then. Too young to have fought in the war, so I'm guessing you've never shot anyone before, have you?

WALTER: First time for everything.

DOCTOR: But that's how all this started. Jex turned someone into a weapon. Now that same story's going to make you a killer, too. Don't you see? Violence doesn't end violence, it extends it, and I don't think you want to do this. I don't think you want to become that man.

WALTER: There's kids here.

DOCTOR: I know, who I can save if you'll let me.

WALTER: He really worth the risk?

DOCTOR: Don't know. But you are.

(Walter lowers his gun and walks away. The crowd disperses.)

DOCTOR: Frightened people. Give me a Dalek any day.