Going over this twice, the following passage looks somewhat like the PF has an attitude indication that's gone wrong.
Yes, I know there's no ACARS hit, but he does not seem to be seeing what the PNF is seeing.
I am not sure what he was looking at, but I have a suspicion that he was on a performance instrument scan rather than an attitude scan during part of this, and it may have been due to his attitude not matching what he was seeing ... but I think that if PNF had seen PF's display as being different from his, he might have done something ... what was "putting you on ATT" mean?
Was he switching attitude indicator reference?
2 h 10 min 27 to 2 h 10 min 31
PNF: Fais attention à ta vitesse Fais attention à ta vitesse
Watch your speed Watch your speed
PF: Okay, okay okay je redescends
ok ok ok I'm going back down
PNF: Tu stabilises
stabilize (“stay there”)
PF: Ouais
Yeah
PNF: Tu redescends
You're going back down
2 h 10 min 33
PNF: Selon les trois tu montes donc tu redescends
According to the three you're going up, so you go back down (meaning the three vertical speed indicators... )
2 h 10 min 35
PF: D’accord
Agreed
2 h 10 min 36
PNF: T’es à ... Redescends
You're at ... go back down !
PF: C’est parti on (re)descend
On our way we're going (back) down
2 h 10 min 39 to 2 h 10 min 46
PNF: Je te mets en en A T T
I'm putting you in in A T T
2 h 10 min 42
PF: On est en ouais on est en climb
We're in yeah we're in climb