question:  Why doesn't Zarwell shoot Bergstrom?
context: [p 135 ] By CHARLES V. DE VET monkey on his back Under the cloud of cast-off identities lay the shape of another man— was it himself? The truth lurked in some corner of his consciousness, but it was not reached by surface awareness. At the sight of him a man leaning negligently against a stone pillar, to his right but within vision, straightened and barked an order to him, “Halt!” [p 136 ] Two men hurried through a doorway of a small anteroom to his left, calling to him. At the first turn he saw that the aisle merely circled the stairway, coming out into the depot again on the other side. It took him only a few seconds to push the case into the compartment, lock it and slide the key along the floor beneath the locker. But the fact that they had been expecting him meant that others would very probably be waiting outside. A tall ruffian, copper-brown face damp with perspiration and body oil, grabbed him by the jacket and slammed him back against the lockers. Bergstrom’s neat-boned, fair-skinned face betrayed no emotion other than an introspective stillness of his normally alert gaze. It rose in a foot-high wave and rolled gently toward the far wall. The floor continued its transmutation, and Zarwell sank deep into viscous depths. Zarwell grunted acknowledgment and pushed himself to his feet, apparently unaware that his shirt clung damply to his body. The evening meal hour was approaching when he reached the Flats, on the way to his apartment. The feeling was there again, like a scene waiting only to be gazed at directly to be perceived. Zarwell moved among them, seldom taking part in the individual clashes, yet a moving force in the conflict . He moved in and joined a party of short, bearded men, directing them as they battered at the wall with a huge log mounted on a many-wheeled truck. Zarwell was not the leader of the invaders, only a lesser figure in the rebellion.
output:  Zarwell is a freedom fighter, not a cold-blooded killer.
options:  Zarwell may have been a killer in the old life, but not now.  Zarwell is trying to start a new life. He doesn't want to kill anymore.  Zarwell is a freedom fighter, not a cold-blooded killer.  Zarwell likes Bergstrom. They are friends.