Mason was programmed to be a Soviet sleeper agent, but Reznov interfered with his programming and added the directive for him to kill these three men in revenge for Petrenko's death, which leads to the scene where Steiner is murdered.
Mason was programmed to be a Soviet sleeper agent, but Reznov interfered with his programming and added the directive for him to kill these three men in revenge for Petrenko's death, which leads to the scene where Steiner is murdered.