Leg Breaker

Prerequisite(s): Heal (6 ranks)
Benefit(s): Using your knowledge of anatomy, you modify your attacks in order to inhibit your target's mobility.
Whenever you make a melee attack against an enemy, you can choose to convert 50% (rounded up) of the damage that is dealt by that attack into nonlethal damage in order to cripple them, reducing their movement speed by 10 ft. for [x] rounds; this penalty applies to every mode of movement that they possess.
[x] is equal to the number of ranks that you possess in the Heal skill divided by two (rounded down)
Whenever you make a ranged attack against an enemy, you can choose to convert 50% (rounded up) of the damage that is dealt by that attack into nonlethal damage in order to cripple them, reducing their movement speed by 10 ft. for [z] rounds; this penalty applies to every mode of movement that they possess.
[z] is equal to the number of ranks that you possess in the Heal skill divided by six (rounded down)
Special: The effect of this feat can be applied to the same target multiple times; each time you cripple a being that is already crippled, their movement speed is reduced by an additional 5 ft. and the duration of the cripple effect is refreshed.