Answer: Mrs. Mitty breaks into her husband's fantasy as he is imagining himself the commander of "a huge, hurtling eight-engined Navy hydroplane" fighting its way through a storm approaching hurricane velocity.
Explanation:
Not so fast! You’re driving too fast!” said Mrs. Mitty. “What are you driving so fast for?”
Very quickly James Thurber informs us that Mitty lives in a fantasy world at least partly to escape from his domineering wife who has the annoying habit of repeating everything she says.
She changed by becoming more confident. Her view on herself and her brother has changed and instead of reaching for what she thinks is her goal, she finds a greater goal, which is supporting her brother.
