On the final mission when you must choose to shoot Jamie or Lambert, shoot Jamie. Open the door and move Jamie's body in between it. Have half of his body in the room and the other part outside it. Face his body so that his upper half is sticking outside, then run outside and hide in the dark. Watch his body. The door will try to close twice, then it will just close through his body. If you see the trail of blood on the floor, which is really Lambert's when he was dragged in here, it will look as though Jamie was dragged in here, tortured, then had the door slammed through his body. When the JBA guards come over they will act strangely. Note: This may require a few attempts.