what do you infer from zarff's secretive behavior?

Well, he's one strange dude. It takes awhile to get around to what he intends to do with Rainsford. He also takes awhile to get around to hunting his mammal of choice. At least Zaroff knows what he does for kicks is strange enough to keep a secret.

i infer that he doesnt want others to know that he hunts humans he akso doenst want to scare rainsford hr gives him the answer slowly