What is the verbal irony in "The Most Dangerous Game"?what is the irony too.?

 Another example:

After dinner, when Rainsford declines General Zaroff's invitation to visit the trophy room by stating that he is not feeling well.  Zaroff comments, "You need a good, restful night's sleep.  Tomorrow you'll feel like a new man...we'll hunt, eh?  I've one rather promising prospect--"

Of course, later the reader realizes that Rainsford is the "prospect."  But the verbal irony is that at the time Rainsford has no idea that he is going to be the "prospect," and, he will, indeed, "feel like a new man"--a hunted man.