This article is from the The Terminator FAQ, by Karsten A. Loepelmann kloepel@connect.ab.ca with numerous contributions by others.
When faced with killing someone, Sarah cannot do it. This scene is meant to
show that she is *not* like the Terminators. She has something they don't
have: feelings. (She also sees Dyson with his *family*--something machines
don't have.) These feelings will not let her kill even one person. Note that
it is not necessary that Dyson dies--there are other ways to alter the
future.
 
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