I have heard that the ride wasn't e-stopt for 15 minuets after the accident.
It made me wonder why rapid ride's currently don't have tracking systems to track each individual rafts progress through the ride. A system like the could've E-stopt the ride when a raft is taking to long to go through an area.
A system like this would not be ideal since it would still take a few minutes for a system like this to detect a irregularity and E-stop the ride, but anything is better the 15 minutes it took in this accident.
Most rapids rides have multiple observation points that attendants stay at in order to see every inch of the ride in case something goes wrong, and also have their own E-Stops and ways to communicate to the ride's station.
The biggest issue with this incident is that Adventureland did not have proper observation points throughout the ride and also lacked the proper communication methods in order relay and react to the situation all the way from the ride operators to the park itself. It says much that emergency personnel arrived at the park and the park was still not fully aware of the situation transpiring.