My first tutorials on screenwriting were through DVRs paper correspondence. The course included two script First Blood and Jaws. The Antagonist were introduced early. Lessons from First Blood pinpoint on reaction, Reaction and counter-reaction all stemmed from the need for a “Simple thing.” and the denial by the town’s Sherriff. You know the rest.
Jaws the antagonist nears the shores on a quiet night until the young swimmer’s jumps in for one of those naughty night’s swim.
Count the minutes. The inciting incident happened in under fifteen minutes…you know the rest.
Two different Killing machines but triggered nonetheless.