Usage of fast pace:
The author can use the fast pace in the sentence when she/he wants to keep her/his readers hooked up in the story. Mostly, action stories are fast compared to suspense stories. The author can fast pace the story until a tensed climax appear.
The author can achieve this by using an active voice in the sentence. She can also avoid using extravagant details of the scene. By using simple and direct statements, she can increase the pace of the story.