Given how inexpensive cameras are, I would think they would have many on the side rail to observe if people were coming out of harnesses or if the raft was going correctly - seems like for safety they would want to observe details.
There are stories from people who said that the harness broke at the same spot the young man died and they had to hold on with their hands. These were grown men and the slide goes over 65 miles and hour.
Also, the child was too short, too young and under-weight to be riding. They had a cut off age of 14 and he was 10. And the 3 man toboggen had to weight in excess of 450 pounds or it had problems.
After this happened, calls from the public are coming in that a lot of people experienced the broken harness.