Normal: By speaking this utterance, you order the air to pulse violently, knocking creatures to the ground.

Creatures in the area are knocked prone and take 1d6 points of sonic damage + 1d6 per two levels.

Reverse: You conjure a more directional shock wave that pushes creatures straight up.

Any creature in the area who is prone may get up. This does not provoke attacks of opportunity, as their foes are too busy being several feet in the air.