In addition to what have been already mentioned, Sanford Rainsford, a hunter, is a predator who initially have no sympathy for any prey. In the exposition of the story, Rainsford tells his friend Whitney,
The world is made up of two classes--the hunters and the huntees. Luckily, you and I are hunters.
Rainsford is a skilled hunter who can construct various traps, who knows how to track exceptionally well, and who is Darwinian in his belief that the stronger should survive others.
While he is initially horrified when deducing that General Zaroff hunts the "dangerous game" of men, once Rainsford experiences what it is like to be "a beast at bay," hunted by Zaroff as he avoids the Malay Mancatcher and other traps and terrified for his very life, Rainsford changes his judgment of horror to one of enjoyment in the place of the vanquisher. For, after he kills Zaroff, Rainsford congratulates himself on his slaughter, "He had never slept in a better bed."