Why is sudden throttle release dangerous when operating a Personal Watercraft (PWC / Moto de Agua) to avoid an obstacle?

1. Releasing the throttle activates an emergency reverse brake that flips the craft forward
2. The engine will instantly flood with seawater through the exhaust manifold
3. Jet propulsion steering relies on the thrust nozzle; releasing the throttle eliminates steering capability
4. The craft will immediately lose all hull buoyancy and submerge