My opinion to RK´s last off: Robert simply braked too late.

If the pedal gets soft the driver would try to pump it, but we see no flashing brake lights or brake lights at all before it is too late.

And in the moment the brake lights flash on, the tyres are locked up immediately (all 4 tyres) but it is too late...

If Robert had tried the handbrake the rear wheels only would have locked up.

Is here somebody who has another theory?