T-1000 played Kyle Reese in "The Terminator", in the role with the explanation that Skynet managed to acquire Reese's DNA and use it for a new Terminator. Cameron ultimately dropped this idea after deciding the audience would find it too confusing: eventually casting came down to Robert Patrick, as a deliberate contrast to the original Terminator - Cameron stated "I wanted to find someone who would be a good contrast to Arnold. If the 800 series is a kind of human Panzer tank, then the 1000 series had to be a Porsche." For a more machine-like performance, Patrick had to learn
Terminator (character concept) of acquiring knowledge and performing problem solving through reason based on whatever it learns. Terminators, being machines, do not have human emotions. According to Reese, Terminators "can't be bargained with, can't be reasoned with and [don't] feel pity or remorse or fear." Terminators also do not value life, and pragmatically kill in keeping with their programming, i.e. to fulfill their mission. In "Terminator 2", when John Connor realizes that the T-800 was about to kill a man they encountered, he responds "of course, I'm a terminator." Conversely, when discussing a variation on the "Blade Runner" 'tortoise test' in "Terminator: The