Machinbird
The poor PF was not only the PF, he was also the deputy Captain at the time.
He was trying to correct a PIO when by the book he should (as Capt) have called Unreliable Airspeed.
PNF didn't realise that all this was way too much for the PF. He could have done more to save the ship.
I suspect, without proof, that AF procedures (seemingly assuming that nothing would go wrong) contributed a lot that night.