So what this aileron does is counter the rudder needed to hold knife edge, and keep the plane in a 90 degree bank. The next ones are exciting. Now that you are holding the plane on a 90 degree bank with a small amount of aileron and opposite rudder, the only other control that needs to be taken care of is the elevators. To better understand why this happens, we will go to the most basic aspect of flight, straight and level. When a plane is flying straight and level, the wings produce lift to keep it flying.
Lift pulls the plane towards the top of the wings, which in straight and level flight is up.
Both wings are traveling through the air at equal speed. The weight of the plane, however, counteracts this lift. This is why planes fly straight and don't shoot up into space. But since the weight of the plane is supported by the rudder, there is nothing counteracting the lift. The effect of uncountered lift is to make the plane rise.