No I didn’t. Jets use Newton’s third law of motion: “To every action there is always opposed an equal reaction” or formaly called as Jet Propulsion: http://en.wikipedia.org/wiki/Jet_propulsion. It also works just as well with water. The law also works with solids but throwing solids to propell yourself isn’t really practical.
By the way, manipulating air pressure directly seems nonsensical. Pressure is the force applied to a unit area of surface. Pressure is pressure no matter what the sorce of the force is. Now there is an equation that describes the nature of pressure (P = F / A). If you change/manipulate Pressure directly, as aeromancers do it seems, then the equation would be broken.
To illustrate, imagine a bottle resting on the table. It would exert pressure on the table because of its weight (force) it exerted on the table. Now imagine there is a magical study called bottlemancy (:d/ ). If it is similar to aeromancy then it would directly control the ‘bottle pressure’ so to speak. Now you could then increase the pressure a hundred times. Now this situation is ridiculous. We have a bottle that exerts a hundred worth of bottles of pressure on the table. Or say you change the location of the pressure to the other side of the table. Again another ridiculous situation. We had a bottle that exerts pressure not on the surface it was on but on the other side of the table. You know what I mean?
Also about this air shield, doesn’t it create drag too? Shields blocks things and blocking air essentially creates drag. For that, I had a suggestion for Aeromances. Instead of blocking the air/wind like how the shield does, why not push them to the side making the air flow around, very much like how the ship prow cut and pushes the water to the side. This method creates less drag and thus requires less energy to maintain. What do you think?
By the way I’m quite human. The saying is quite disturbing. I much rather prefer skinning oranges thank you.