That was an incredibly close call. Of course the pilot got into a bad situation, but ultimately that ‘stall turn’ was a canyon escape maneuver - unload the wing, trade altitude for airspeed to get the tightest turning radius possible so you DON'T stall.
There aren’t enough expletives to describe this. Looks like this aircraft run out of air and decided to do a wing over to prevent a crash into the mountain. No idea of the circumstances but it appears that they, whoever they are, got away with it. 🍀