I have to admit, I haven't been paying too much attention to the Olympics. Other than the idiot who started the triathlon swim with rib reversing at speed with what looked like a couple of 300hp Suzuki outboards on the back. Lucky nobody was injured.
The RIB was stationary at the instant of the start, and only began to move after competitors had entered the water.
1000% right that the idiot should never have started the race with the RIB there, but the guy driving the boat should NEVER have started moving once there were people in the water around him. There was obviously going to have to be a restart - he just made it worse by not staying put.