Pretty gentle quarter roll for the poor old thing.
 
http://www.abc.net.au/news/2016-11-18/rally-car-rolls-in-adelaide-hills/8038724
 
But how did that happen? Didn't look to hit a kerb or anything, just kinda fell over!

yeah, maybe just bad luck?  it looked like the road dipped away slightly just at the wrong time and unloaded the drivers side and it tripped up.
 
I wonder if it would have come back down if you backed off in time??
 
 

Misread the road. A later turn with the tail hanging out might have gone OK :D

D/S front wheel lifted out of a small dip in the road, enough to unsettle and that little too much speed going into the corner was enough to tip it over. Hurties!!

That section of road was recently upgraded and in this year's event presented as a faster corner than last year.  It is pretty smooth though and there is no real reason for Bruce's car to roll.  As said above, probably just just a dip/bump on the inside wheel was all it took with the outside pretty well compressed.  He had just finished a long term rebuild of the car.....such a shame for him.

yes - paix