I believe that the stall warning has nothing to do with the mental problem of the PF :
whatever the stall warning, the PF wanted to nose up and didn't understood why the PNF and the Capt asked him not to.
Abstract :
2 h 13 min 40
PF : But I’ve been at maxi nose-up for a while
Capt : No no no don’t climb
PNF : So go down
2 h 13 min 45
PNF : So give me the controls the controls to me
PF : Go ahead you have the controls we are still in TOGA eh
2 h 14 min 05 4,024 The pitch attitude is 14°.
Capt : Watch out you’re pitching up there
PNF : I’m pitching up?
PF :
Well we need to we are at four thousand feet
(My) Conclusion:
The Capt. didn't knew how much the PF was nosing up but knew he shouldh't have.
The PNF knew he had to nose down but his fear prevented him from a strong forward stick;
The PF has alway wanted to nose up except when asked by the PNF or the Captain not to do.
The actions of the PF have been unbelievable / misunderstood by PNF and the Captain.
Not only the PF has created the stall by a stupid nose up but he has commited
"a crime" when at 02:11:39 he took the controll back from the PNF without annoucement and continued to nose up against PNF and Capt.