Guys, please do not confuse "what's possible" and "what happens on P3." If one CW motor stops, then FC tries to keep horizontal, increase power of failed CW motor, decrease opposite side of CW motor. Then theoretically 2 possible ways - if not enough high gain (rapid) to stop turning over, then it flips out. If FC can avoid turning and then decrease surviving CW motor, then CCW wins and strong yaw occurs. If intentional "fail recover" program is not implemented, going which way is decided by sensitivity of each roll+pitch, yaw sensor IMO.
The footage happydays shown, real P3 seems to turn over... But I've ever seen spinning Phantom video (maybe P2), that'll be because not perfect ESC/motor death, or may props broken (partial thrust remaining).
As Morgan shown, prefer spinning may be programmed by designers. ESC/motor/prop failure can be sensed by FC, then enter into "3 motor mode." Spinning in one position is much safer then falling off. If very high speed "home lock mode" is available, an operator can call his poor bird back to the home
, but even if not, slow descending may save the bird and people on the ground.
I once opened the body of P2, found one ESC-motor cable was almost broken (bad soldering in factory). Hope DJI programs safe mode in future - don't they currently have that technique for expensive A2 controller? I've ever seen under $100 toy enters into spinning mode when one rotor crashes.