You are an expert skirmisher, able to rain missiles upon your enemies whether advancing or retreating.
Benefit: Once per encounter, when using the withdraw action, you can make a single ranged attack at any point during your movement.
Normal: You cannot attack when using the withdraw action.
Special: Starting at 6th level, a ranger with the archery combat style may select Parting Shot as a combat style feat.
Advanced Player’s Guide. Copyright 2010, Paizo Publishing, LLC; Author: Jason Bulmahn.