Flat characters—minor figures that play a supporting role in the story—are used to move the plot along, providing subtle exposition. Such characters do not undergo substantial change or growth in the course of a story. They are also known as "two-dimensional characters" or "static characters."
Rainsford believes Zaroff will never stop hunting him. -is the reason justifying Rainsford’s actions that is best supported by Rainsford’s statement, "I am still a beast at bay.”