Disrupting Blow p. 63
With a combination of brute force, keen timing, and exacting aim, you force your opponent into an awkward position that ruins his next action.
As part of this maneuver, you make a melee attack. If this attack hits, your target takes normal melee damage and must make a Will save (DC 15 + your Str modifier) or be unable to take any actions for 1 round. The target does not suffer any other drawbacks or penalties. He can still make attacks of opportunity.
If the target is under an effect that grants additional actions (such as the Schism psionic power or the Dual Action ability of a Choker), that effect is suppressed for the duration of this maneuver.