If smoke and flames are detected originating from the rear engine compartment of a passenger bus, why must the driver NEVER abruptly fling the engine hood fully wide open?

1. Fully opening the engine hood introduces a sudden rush of oxygen that triggers an immediate flashover explosion (爆燃/回燃); the driver should crack the hood slightly or discharge through fire extinguisher access ports
2. Opening the engine hood causes the engine cylinders to fall out onto the road
3. The engine hood is electrically wired to the steering wheel and will lock the brakes
4. Engine fires can only be extinguished by driving into a car wash