Read this quote from O. Henry's "A Call Loan" With a gun in each hand Merwin raised himself from behind a clump of chaparral and started for the engine. But before he had taken three steps, two long, strong arms clasped him from behind, and he was lifted from his feet and thrown, face downward upon the grass. There was a heavy knee pressing against his back, and an iron hand grasping each of his wrists. He was held thus, like a child, until the engine had taken water, and until the train had moved, with accelerating speed, out of sight. Then he was released, and rose to his feet to face Bill Longley.

How is this excerpt an example of the Western genre?
Merwin attempts to escape from his debt by jumping on the train.
Longley independently enforces law and order on his misguided friend.
Merwin shows his cowardice by trying to take advantage of others.
Longley is violently cruel, a trait typical of Western main characters