Left props appeared to be feathered before impact,
Not so sure on that 1.
Not to speculate, but man this pic tells a thousand words.
Ndebele sends recovery wishes: News24: SouthAfrica: News
That looks to me as if the blades on number 1 didn't go to feather. J41's as with all TPE engines have the NTS (Neg torque Sensing) and in the case of a J41 auto feather.
Looks like they were dragging an unfeatheredable engine. A totally amazing feat of flying and airmanship to get it on the ground in 1 piece and in the only open spot.