What a couple of morons. The cager was nuts, but the motorcyclist put a significant number of innocent people at risk the way he was riding (wrong side of the road, splitting traffic at HIGH speeds, including another two-wheeled rider who probably lost bladder control).
The motorcyclist had all kinds of options. Hit the brakes and turn around, out accelerate the car and lose it (he kept on slowing down to allow the car catch up!), "pull over" with the car and then leave the car behind. Stupid stupid stupid.