Todorov's Theory

Todorov was a Franco-Bulgarian philosopher who lived in France since 1963. His work on narrative theories from the 1960s onwards, suggested that stories in films begins with a equilibrium or status quo where any potential opposing forces are in balance. This is then disrupted by an event which sets a chain of series of events and then problems are resolved so that everything goes how is mean to be in the world of fiction.

Equilibrium = State of well being and normality between the protagonists.

Disequilibrium = Normality is disrupted  due to a conflict or an occurrence of an event.

New equilibrium = The outer force is defeated and a new state of well being s acquired.

 I applied Todorov's theory on the film Insidious 2 as well...

Equilibrium: everyone starts settling down in the grandmothers house without tension whilst their old house was causing them problems.

Disequilibrium: The same things that happened in insidious 1 started to happen in the grandmother’s house with the piano playing and things being moved about at night times.
New Equilibrium: In the end they get rid of the bad spirit and the family is safe and at peace.