Say the flaps are up, and one gets shot off. Are you saying that the plane will act as if the flaps were still up, even if I command the remaining flap to lower? Or are you saying that the remaining flap will not deploy (or raise) if the other has been damaged?
in that case, the undamaged flap will lower.
i just had this happen in a lancaster last night. an me110 shot my left flap off. when i was lined up for my landing, i deployed my flaps. the aircraft was sorta ok at 10 degrees......at 20 degrees, it got so hard, that i simply retracted them, and landed with no flaps.