I never make a hard turn in my boat....its a big ocean, no need for it. I usually have 3-4 guests on my boat who trust that I know what I am doing. I know the techniques used to set up for and execute a turn at speed, but I'm not looking to use those techniques if I don't need to, especially with people in the boat.
I hate to hear about these accidents but they always serve as a reminder to excercise caution. If anything can be taken away from this, it is that; BE CAREFUL!