Density altitude as KK says well above... think.maybe rotor effect too. iOW staggering about unknowingly far too near a stall and turning such a large span effectively downwind.
In some aviation circles, theres a term called 'tip stall' where the inner tip in a turn drags back and drops.
Unless a wing engine did just 'let go' which will likely be discovered if so...
So tragic... indeed, fate is the hunter.