General | Combat Stamina
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Stunning Pin (Combat) Source Ultimate Combat pg. 122 You can render a pinned foe temporarily incapacitated. Prerequisites: Improved Grapple, Improved Unarmed Strike, Stunning Fist. Benefit: Whenever you pin an opponent, you can spend a swift action to make a Stunning Fist attempt against that opponent. Combat Trick (from the Combat Stamina feat) Source Pathfinder Unchained pg. 133 You can spend 5 stamina points to use Stunning Pin as a free action instead of a swift action.

Stunning Pin (Combat)

Source Ultimate Combat pg. 122
You can render a pinned foe temporarily incapacitated.

Prerequisites: Improved Grapple, Improved Unarmed Strike, Stunning Fist.

Benefit: Whenever you pin an opponent, you can spend a swift action to make a Stunning Fist attempt against that opponent.

Source Pathfinder Unchained pg. 133
You can spend 5 stamina points to use Stunning Pin as a free action instead of a swift action.