Anchor: The cowboy has to lean back and hold on as hard as possible, clinching his teeth at the prospect of getting bucked off.
Entailed: A person is leaning back.
Contradiction: Nobody is leaning back
Contradiction: The man was known for being week, lacking connections and being unable to think outside the box.
Contradiction: There is a skateboard.
Contradiction: The man is sleeping at home.
Contradiction: There are multiple horses.