Source: Starfinder Core Rulebook p.160
You are an expert skirmisher and are able to take a final shot as you retreat.
Prerequisites: Dex 15, Mobility, Shot on the Run, base attack bonus +6.
Benefit: When using the withdraw action, you can make a single ranged attack at any point during your movement. If you have the trick attack class feature and are using an appropriate weapon, you can add your trick attack damage to the attack you make while withdrawing. Once you use this ability, you can’t use it again until the next time you regain Stamina Points with a 10-minute rest.
Normal: You can’t attack when using the withdraw action.