
Frank T. answered 10/03/19
Ph.D. in Film & TV Studies (UCLA) with 35 years of Teaching/Publishing
There is no universally accepted term for the narrative step you refer to.
However, film theorists offer different words -- Disruption, Complication, Transgression, Disequilibrium, etc.-- to use for that step in narrative structure. By the way, these ideas pertain to ALL movies, not just horror films!
And, in mainstream movies of most genres, the equilibrium is almost always restored at the end, the Resolution stage.
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