why didn`tthe pnf took controll?me think it maybe a human factor issue.
the cpt had just giveb controll to the younger pilot.bit when all happened
the pnf assumed what was wrong,but wasn`t 100% sure.
so maybe he thougt,when the cpt returned taht he (the pnf) had just took the first opportunity to take controll because he was angry at the cpt decision.
soory but english is not native language