The police assault the building and fatally shoot Dyson, but he detonates the explosives as he dies.
Believing that his work must be destroyed, Dyson helps Sarah, John, and the T-800 break into Cyberdyne.
Dyson reveals that his research has been reverse engineered from the CPU and severed arm of the 1984 Terminator.
John arrives and reconciles with Sarah while the T-800 convinces Dyson of the future consequences of his work.
She attacks Dyson in his home but realizes she cannot bring herself to kill a person and relents.
Sarah plans to escape to Mexico with John, but a nightmare about Judgment Day convinces her to kill Dyson.
And John teaches it catchphrases and hand signs while encouraging it to become more human-like.
Over the course of their journey, Sarah sees the T-800 serving as a friend and father figure to John.
Although distrustful of the T-800, Sarah uses its knowledge of the future to learn that a revolutionary microprocessor, being developed by Cyberdyne engineer Miles Dyson, will be crucial to Skynet's creation.