It wasn't scientific for people with wings to fly vertically in fantasy novels. This was because characters in fantasy novels often had the ability to fly, and the ability to fly was often related to the shape and strength of their wings. Therefore, characters would often choose to fly vertically to show off their wing strength and flying skills. However, in reality, it was impossible for humans to have wings and fly vertically. Wings were a part of the human animal's body, made up of bones and muscles. They couldn't be controlled freely like in fantasy novels. Therefore, the flying scenes in fantasy novels were not feasible in reality.