explain rainsford's reaction to hearing about the "new" animal?

Rainsford finally grasps the meaning behind Zaroff’s cryptic statements: Zaroff hunts men. He can’t bring himself to believe that this could be true, but Zaroff assures him that he is not lying. Rainsford simply cannot comprehend how a man so civilized could take part in such a barbaric practice. Zaroff explains that he views his sport similarly to war. Rainsford is disgusted by this comparison because he feels that what Zaroff does is more akin to murder. Zaroff finds Rainsford’s reaction amusing and incredibly naïve. Zaroff encourages him to try the hunt but Rainsford declines.