The hero will drown.
What will happen after he drowns?
He'll be eaten by sharks.
It can be dangerous to try to rescue someone that is drowning, but you should do everything in your power to try to aid them. If you are a strong swimmer, you should try to reach them and assist them, otherwise they may die and you'll regret not helping. If you're not a strong swimmer, try to find a life guard who is.
I don't care, I just want to see him drown.
Standing by and watching someone drown is awful. Trying to get help or helping directly is the humane thing to do. What if you were the one drowning?