Final answer:
Mark Twain's language in the passage captures his fear and panic, as he describes his behavior and the dangers he faces.
Step-by-step explanation:
In this passage from 'A Cub Pilot', Mark Twain uses language that captures his fear and panic. The words he uses, such as 'shock', 'dangers', 'perils', and 'sepulchral cry', all contribute to the sense of urgency and danger that the narrator is experiencing. Twain's description of his behavior, climbing the wheel like a squirrel and spinning from port to starboard, further emphasizes his frantic state.