Before the days of CGI, James Bond used to actually hang out the back of airplanes, clutching a flimsy net as it waved back and forth thousands of feet above the ground. That's why this scene continues to pack a punch -- they're really frickin' doing that!
In jeopardy himself, Bond doesn't go to the trouble of making Necros' a big show. He just wants him off. So it's simple logic: if the goon is holding on to your boot, take off your boot. Who knows, maybe he'll get lucky and the leather footwear will break his fall. Maybe.
