Strike Upon the Stones
From DivNull RPG
As the crane pounds a snail upon a rock to crack its shell and get to the meat within, so may the disciple of the crane lash out at a prone foe. Whenever the character knocks an opponent down, she may attempt a normal attack against that opponent using her full Martial Arts + Dexterity dice pool. This attack does not count as an action and does not subtract from the character’s dice pools or affect her actions for the turn.