You fire a blast of focused air at your target. This allows you to make a special combat maneuver check against target’s CMD. You use a bonus equal to your caster level + the spell’s level + your Intelligence, Wisdom, or Charisma modifier (whichever is highest). If you hit the target’s CMD, you can affect the target with a bull rush, disarm, or trip. If you miss, the target cannot attempt to make a combat maneuver against you because of your failed attempt. If you bull rush the target with an airblast you move the target up to the maximum distance allowed by your CMB check without moving yourself.