unless the Captain of flight ( the person at yoke) decide to shift command over-to co-pilot he is only an observer helper navigator with flight manual / log open in his lap. His duty is only to repeat the action of person at Yoke , yes only repeat and say : check, roger , affirmative. - all is recorded over CVR.( cockpit voice recorder) even the dirty jokes they share or talk about a fellow female crew member.
CVR is automatically erased at end of safe landing and when GPU is connected.
Cockpit voice recorder will reveal the suicidal intentions of the criminal pilot. Co-pilot is allowed to TAKE OVER ONLY when Captain is physically disabled to act.
In case of PK 8303 the captain was either drunk or sick with no focus over flight controls and destroyed 99 families.