@ 727forever
If one stick is full aft and one stick is full forward the airplane will take the "total input" and give you an average, which in hat case, would be zero (or stick neutral). You can press and hold a button the joystick that will enable you to take "priority". The A/C will tell you, "priority left, or priority right". the last guy who presses the button "wins" . if you hold it for more than 30s, the other stick is completely useless for the rest of the flight.
This is why in the AF crash if the CA would have jumped in, sat down, yelled, "I have control" and pressed and held his button the outcome may have been different. In all the chaos he may not have heard the airplane screaming "dual input" and probably didnt visually see the inexperienced, clueless F/O holding the stick full aft.
It may be an Airbus but the laws of Physics trump Normal, alternate, direct law etc. The A/C is stalled? Unload the wing and get the nose down for Chr--t sake, BASIC FLYING