Game of Thrones is a low fantasy series, and therefore magical events, mythical heroes, the Darkness of the Great Other, fantasy objects, and creatures are often viewed as outlandish by characters who suppose they live in a somewhat normal world. After the fall, Bran Stark is terrified to hear Old Nan's description of the winter and the Long Night. She is able to strike fear into his heart because the boy of ten knows nothing about the Long Night and the coming of the White Walkers or the associated legendary creatures.