The blade begins nearly flat on the water, at only a slight planing angle to keep the blade from plunging. As the torso rotates and brings the paddle forward through the water, the angle of the blade changes, becoming nearly vertical by the time the paddle is perpendicular to the kayak (again, just as in a standard reverse sweep). The planing angle can be adjusted throughout the stroke for greater support, as necessary.
With the support provided by the stroke, you can lean the boat easily throughout the turn: the greater the lean, the quicker the turn. At the end of the arc, as if doing a sculling stroke, uncock the wrists to rotate the paddle so that what was the trailing edge becomes the leading edge. Now skim the blade, power-face down, back over the water toward the stern. Then cock the wrists to rotate the paddle, and sweep forward again. Repeat until the turn is completed.
Like the low-brace turn with a standard reverse sweep, the high-brace turn with a Power-Face Reverse Sweep is a braking turn-that is, forward momentum slows, then stops after the turn is initiated.
The stroke does not have to be preceded by a high-brace turn to be effective. If a high-brace turn (which assumes forward momentum) is used to initiate the maneuver, the brace and sweep result in a braking turn and will stop you; but, the turns are often nearly 180 degrees, so I am reversing direction anyway, in most cases.