It is present because they are watching the movie right now.
Repetition in writing can contribute to text because it can help to emphasize a point and gives words rhythm.
Bradbury's short story, There will come soft rains, describes the extinction of mankind after a nuclear holocaust in the year 2026. He portrays his idea, when applied the there will come soft rains, in the main theme that before the destruction of human race technology begins to outlast and outpace humanity.
It grabs the audience's attention.
