Final answer:
The author builds tension through pacing by using dialogue to directly convey the narrator's shift from confidence to anxiety, employing vivid details and imagery for an immersive experience, and manipulating narrative structure to create unease.
Step-by-step explanation:
The author's use of pacing creates tension in the passage through several literary techniques. The first and perhaps most direct is dialogue, where an exchange between characters can reveal underlying nerves or anxiety, heightening the sense of tension. For instance, when the narrator's move shifts from confidence to anxiety as a result of the captain's questioning, the dialogue places the reader directly into the escalating tension of the moment.
Another method employed is the use of vivid details and imagery, which acts to draw the reader into the scene and create an immersive experience. Twain's pacing involves a gradual build-up of detail, effectively making the reader feel the mounting pressure as more individuals gather on the deck, witnessing the narrator's growing discomfort. Twain's description of the scene intensifies the reader's perception of danger, propelling the plot towards its climax.
Additionally, varying the narrative structure, such as switching tenses or incorporating shifts from internal thoughts to direct speech, can keep readers on their toes and contribute to a sense of unease. These techniques often blur the lines between reality and the narrator's internal state, further complicating the pacing and adding layers of tension to the narrative.