I have really mixed feelings about hunting. I eat meat and so I pay people to slaughter the animals I consume. It’s not a very nice process and one I try to pretend doesn’t happen. Hunters have the integrity to take animals in a humane way and are an important part of managing the population of species like deer that have mostly had their natural predators driven off by humans. I have deep respect for people who are capable of being ethical hunters. I’m too much of a coward to look at an animal in the eyes and pull the trigger…and yet I eat meat. If it really was about survival for my family and myself, I would probably be able to do it, but it would not be an easy or joyful thing.
That said, there are people who get off on killing animals and making them suffer. This is grotesque and psychotic behavior as @Pandora mentions. I’d avoid being anywhere near your friend’s brother’s friend. That guy sounds disturbed.