It is very clear that PF was confused from the start and disbelieved airspeed.
What did he see on his attitude indicator?
PNF kept telling him to descend, at one point saying "all three say you are climbing so descend";.
Note: when talking a pilot out of vertigo or scan breakdown, I learned the hard way that an effective technique is to do what I think the Captain was trying to do. The Captain appeared to be trying to get the PF to use his attitude reference, or was pointing out a problem in the attitude.
What I found works is to make recommendations or commands based on the monkey skills required to remedy the siuation.
Examples.
"Lower nose to horizon." "Raise nose to five degrees nose up. Lower nose to three degrees nose down.
Roll right. Stop roll. Wings level.
Left wing is down, roll right. Stop roll.
Add power. reduce power.
What that does is help the other pilot make corrective actions and re-establish his scan. Not sure what others have experienced in this regard.
My aircraft commander once talked me out of a horrific case of the leans doing just that. I used the technique more than once later on in life.
At one point PNF says ";we still have engines so whats happening"; presumably referring to the low airspeed.
2:12:27 PNF You're climbing (Stall warning), Descend descend descend descend
PF I was descending then?
PNF, Descend
Captain: No, you're climbing
PF: There I am climbing, ok now descend
Looks like someone got behind the aircraft.
I was descending?
No, you are climbing.
Chills up my spine.