Final answer:
The narrator's amazement is best expressed through elaborate comparisons and descriptive diction that utilize sensory detail, visual rhetoric, and a professional tone to engage the reader.
Step-by-step explanation:
The narrator's sense of amazement for both the horse and jockey is vividly captured through elaborate comparisons and descriptive diction. The use of sensory detail allows readers to visualize the scene and feel the intensity of the moment. This descriptive approach brings depth to the narrative, allowing the reader to experience the tension and movement in a way that simple descriptions or dialogue could not.
Examples of this vivid description can be seen with phrases such as '…puffs of dust marked his course,' capturing the urgency and speed of the horse, and the detailed observation of the jockey's 'intensity of his gaze, a strained weariness, a piercing wistfulness of keen, gray sight,' which provides insight into his character. The author's skilled use of visual rhetoric, including line and light, engages the reader and brings a professional tone to the writing.