DOCTOR: Hello.
DAVID: Get back or I'll use the gun.
DOCTOR: Yes, I imagine you will. You like guns, don't you.
DAVID: This is a specialised weapon. It's designed for roof duty, designed for long range. I've never used one up close before.
ALEX: Let him go.
DAVID: No.
DOCTOR: No. In fact, let him come a little closer.
DAVID: Stay where you are.
DOCTOR: Why? Scared? Why should you be scared? You're the one with the gun.
DAVID: That's right.
DOCTOR: You like guns, don't you.
ALEX: He'll kill you.
DOCTOR: Of course he will. That's what guns are for. Pull the trigger, end a life. Simple, isn't it.
DAVID: Yes.
DOCTOR: Makes sense, doesn't it.
DAVID: Yes.
DOCTOR: A life killing life.
ALEX: Who are you?
DOCTOR: Shut up. Why don't you do it then? Look me in the eye, pull the trigger, end my life. Why not?
DAVID: I can't.
DOCTOR: Why not?
DAVID: I don't know.
DOCTOR: No, you don't, do you.
(The Doctor takes the gun from David.)
DOCTOR: Throw away your gun.
(Alex drops his gun.)