“It is conventional in film, as in theatre, to ensure that the audience is aware (though not necessarily consciously) of the ‘turning points’ when each segment of a sequence starts and finishes. These are most often signalled through action rather than dialogue. Drama is not merely action – it is action and reaction. It is how someone reacts to another person, to a sound, a sight, a place, a movement, a moment of choice, that tells us who they are and what they feel.”
Branigan, Edward (1992). Narrative Comprehension and Film. London/New York: Routledge.