"Too bad you didn't just take Max up on his offer, Four. Well, too bad for you, anyway," says Eric quietly as he clicks the bullet into its chamber. My lungs burn; I haven't breathed in almost a minute. I see Tobias's hand twitch in the corner of my eye, but my hand is already on my gun. I press the barrel to Eric's forehead. His eyes widen, and his face goes slack, and for a second he looks like another sleeping Dauntless soldier. My index finger hovers over the trigger. "Get your gun away from his head," I say. "You won't shoot me," Eric replies. "Interesting theory. " I say."

Source: Veronica Roth (2014). “Divergent Series Ultimate Four-Book Collection: Divergent; Insurgent; Allegiant; Four”, p.75, Harper Collins