Thanks! I finally figured out what the "corkscrew maneuver" was.
Even so, I can't help but wonder if that training film wasn't more of a morale booster than anything else.
Looking through the Hurricane's gun camera reticule, I kept thinking "That Hudson's so dead!" as I mentally lined up deflection shots at the engine, cockpit and dorsal turret.
Two .303 turret guns vs. two or more 20-mm cannon mounted on a faster and more maneuverable plane just doesn't seem like a fair fight!