Dr. Anthony Ivo: It's harder than it looks, isn't it? Killing an unarmed man.
Oliver Queen: It seemed pretty easy when you murdered Shado.
Dr. Anthony Ivo: I didn't murder her, Oliver.
Oliver Queen: Ivo, you shot her in the head.
Dr. Anthony Ivo: I gave you a choice! You chose Sara. You blame me, but that's because you can't face your own guilt. I loaded the bullets, yes, I pulled the trigger, but you... you aimed the gun. And you hold yourself responsible. Don't you?
Oliver Queen: Yes. But that doesn't mean I won't kill you.
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From: Arrow