Hmmm. Not sure about this. If just one t/r pcl failed there would have been serious vibration as the 'uncontrolled' blade went to 'full left' (because that's what happens) and any pilot input to reduce or control the resulting yaw would increase the vibes to the point that the t/r lost interest and came off.
IMHO that is.
On the other hand, if it did happen, and said driver did get away with it... way to go!
Taff