Desperation sets in. The monk spins his body using the force of the half-orc's blow to change the direction of his attack. Sylaxer feints low and then delivers a powerful snapping kick with far more force than his human form should be capable of.
Sylaxer attempts a Punishing Kick against Hurgah AC 16, while demoralized - with Power Attack: 1d20 + 8 - 2 - 2 ⇒ (18) + 8 - 2 - 2 = 22 (hits)
Potential damage for Punishing Kick with Power Attack: 1d8 + 7 ⇒ (2) + 7 = 9 (applies)
Sylaxer elects for the knock down component of the Punishing Kick. We'll ask Hurgah to make a DC 15 Fortitude save (Base 10, +3 for 1/2 level, +2 Wis).