Answer:
1. When Rainsford reaches the island and starts walking, he comes to a place where there are signs of a struggle. The “fairly large animal” that “thrashed about” in the woods, leaving trails of crimson was most likely a human that Zaroff killed. The “high screaming sound, the sound of an animal in an extremity of anguish and terror” came from the human that Zaroff killed. The crimson trail was a trail of blood.
2. Zaroff has a hand in making the island truly a Ship-Trap Island. He says, “Sometimes, when Providence is not so kind, I help Providence a bit.” He uses flashes of light to confuse the captains of ships into believing there is a channel where there is none. This causes passing ships to get shipwrecked, and the sailors end up at the bottom of the sea or in Zaroff’s cellar.
3. When Zaroff invites Rainsford to his library to show him a “new set of heads,” trophies that he collected from his latest hunting exploits, he is going to show him human heads.
4. Zaroff carries a pistol and gives his human prey only a hunting knife. He knows that in direct combat he may not be able to kill his enemy.
5. In the end, when Rainsford decides he has never slept in a better bed, it is evident that he has killed Zaroff.
Explanation: Plato Answer :) Hope this helps.