Rainsford killed one of Zaroff's hounds with a trap and Zaroff then chased him and Rainsford became cornered. He chose to jump off the cliff to trick Zaroff, Zaroff looked over the edge and didn't see Rainsford.
Zaroff goes home and enjoys a nice meal thinking he won the hunt just because he didn't see Rainsford's body in the Sea.
Zaroff heads into his bedroom and sees Rainsford, inside his room. Zaroff then challenges Rainsford to a duel and loses, Rainsford then sleeps in Zaroff's bed