Anchor: A person, who appears to be male, is riding a dirt bike on a gravelly course.
Entailed: someone rides a dirt bike along a course
Contradiction: A person is riding a horse through the pasture.
Contradiction: a woman on a skateboard bombs a hill
Contradiction: The person is driving a tank on the course.
Contradiction: A person is flying an airplane.
Contradiction: The woman is flying a kite.