Feat: Hunting Snag

Trigger A creature within your reach uses a move action or leaves a square during a move action it's using.

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Learning from nature's predators has taught you how to keep your prey close. Make a claw or talon unarmed Strike on the triggering creature. If it's a critical hit and the trigger is a move action, disrupt that action. If it hits and the creature left a square adjacent to you, you can Step into that square.