I switched onto the big bus just some weeks ago, so I decided to shut up until now... but how some people here speculate on things like the sidestick commands reversing or protections going crazy, I just want to add one thing: Ockhams knife - the most simple solution is the right solution - for some reason somebody just screwed up.
Probable Cause:
Unreliable airspeed leading to the PF reacting to a stall warning with a prologend nose-up command several times, aggrevating the stall.
Contributing Factors:
(1) Lack of training
(2) Man-Machine Interface
(3) Sidesticks not linked -> insufficient monitoring
(4) Icing of the pitots
(5) Fatigue
---- or ----
(6) Somebody beeing plain stupid (reacting to a stall warning with a pitch up is plain stupid) and shouldn't have been let near a cockpit
Just my two cents....