Answer:
The heart beat of the audience usually increase, making the whole experience more intense.
Step-by-step explanation:
Pacing is very important in a video and story telling. A slow pace and a story that gradually builds up can potentially bore the viewer as they loose interest.
However, too fast of a pace and the viewer might get annoyed and not understand the emotional aspects of a video.
There is a good balance that professional film makers work around to ensure that the story grasps a viewers attention. For action films, the pace is relatively higher.
In an experiment, it wad found that the fast pacing of an action film that increase the heartbeat of the viewer by up to 9%. This excites the audience and keeps them on their toes as they get immersed into the experience.