What mistake does the man make in building the second fire?

In building the second fire, the man makes the mistake of not adequately preparing for the conditions he faces. He fails to ensure that he has enough dry material and suitable kindling, which leads to the fire going out quickly. Additionally, he becomes overly confident after successfully lighting the first fire, underestimating the harshness of the environment. This lack of caution ultimately contributes to his struggle for survival.