 Why doesn't Zarwell shoot Bergstrom?
[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? 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. 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.
 Zarwell is a freedom fighter, not a cold-blooded killer.
 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.