Stevie is the sadistic gung-ho new guy in security. He's been dying to join the force and is willing to do whatever it takes to get in good with "the boss" (Chief Hannon), including being particularly overzealous during emergencies.
Escape!: Officer Mack is found in the security office interrogating Amata. If the Lone Wanderer took the Overseer's gun from Amata, he/she has no choice but to fight Mack due to the fact that he attacks them on first sight. However, if you insisted Amata keep her father's gun to protect herself, she will shoot Mack in self-defense, killing him. If you interrupt before Amata fires on him, however, she will escape and the player will again be responsible for dispatching Mack.