The natural instinct of a pilot facing an uncommanded descent is to apply as much aft control column movement as he/she can manage. But if high control column forces are applied in this situation, is there a risk that this would compromise the ability of applying nose-up trim using the manual trim system? Whereas going against instinct and slightly relaxing control column forces might permit the manual trim system to be used?
I once flew an airliner type which used aileron and spoiler for roll control. If either system jammed, it was possible to unlock the control column in the roll sense, so that whichever system hadn't jammed could still be used - aileron only from the left seat or spoiler only from the right seat. However, if the aircraft was rolling when the control jam was experienced, opposing it with the control column (the natural reaction) could prevent the 'unlock' system being used. It once happened to me during flight; fortunately the procedure was well-known and practised quite often in the simulator. Landing using spoiler only was quite difficult though, as the spoilers only operated when the control column was significantly displaced - giving a sort of 'sloppy neutral' feel.