I take it we're talking "in extremis" here, not merely a situation which is covered by standard operating procedures such as initiating a go-around or calling "Stop".
Captains have been known to suddenly lose the plot and do something quite irrational. The Concorde which landed with nearly dry tanks is a good example where the co-pilot was presented with just such a dilemma.
Of course the co-pilot will question the decision....but then what?