Answer: He is tricked by Rainsford
Explanation: In "The Most Dangerous Game", by Richard Connell, General Zaroff's defeat is caused by his own arrogance, because he is tricked by Rainsford. General Zaroff is a Cossack who lives on Ship-Trap island. He is a hunter who is tired of hunting animals. His most satisfying thrill is to hunt human beings. He traps men who are turned into preys. Rainsford is the new victim. Rainsford makes him think that he has died and returns to Zaroff castle. When Zaroff enters Rainsford kills him.