No one can really say how they will react to such unexpected situations, armed or not, the adrenaline alone would preclude any semblance of a rational measured response.
Muscle memory which is the only thing that works when the SHTF.
Training is the only that develops muscle memory. Lots of regular joe super squre OODA Loops out there.
Draw. Present. Front Sight. Squeeze. Surprise Break. BANG !!!!