It's an upset lady with a cellphone here, not a horror movie skit. It's possible the driver was already thinking about murder suicide because of an earlier incident with the passenger and the lady was already afraid of his possible bad intentions. He seemed to pick the deepest part of the river to crash over the side. She was trying to stop him?Or he is afraid to stop, you cant kill a driver while the bus is running with 100km/h, or if the person has a chainsaw a sudden stop can kill the passangers for which the driver will get blamed, so its best to just to let the person with a chainsaw kill them all.....after all its following blindly the law that matters not the result!