Although at the moment, it may seem as if Rainsford's enemy is the sea, he soon realizes that that is not the case. He is hunted by Zaroff, a hunter hungry for intelligent prey, on his terrifying island. Then, at the end of the short story, Rainsford jumps into the water, escaping Zaroff and winning the game. It is ironic because his "enemy" is what saved his life.
One of them is that Gatsby to war when he single handedly defeated the German army another one is that all of his family was dead and that he had inherited all of his money from that family