nope, I can understand a pocket of still air BEHIND a barrier ... but have a hard time envisioning one IN FRONT of a barrier ...
The configuration of the wing's fairing and shield causes a negative air pressure pocket behind the shield which draws air from behind to fill the void. Less pressure inside more outside so it tries to equalize. Since this is a constant process while you are moving, it causes what I call
If you click the flaming word, it will take you to a page with more info.
If you've ever ridden with anyone who does not wear a helmet, you can see this in action because unlike other bikes, you will see your friend's hair being blown forward and not backward. I have a Gerbings jacket liner that worked absolutely fine for all my bikes since '88 or so when I got it. The heating elements are down the front of the arms and in the chest/belly area. With the wing, it's useless because where I get cold is on the back and under the arms & there are no heating elements there.
Best I can do in a short dissertation. This pressure differential is what the Windbender windshield is designed to eliminate. So does the AIRFOIL in this thread so they say.
Simple demonstration for you. Wear a jacket with a hood and leave the hood down. When you are riding, the hood will start slapping your head from behind.