SFS Standard Kill Steal [reaction] Feat 2

Source Player Core pg. 132
Trigger An ally ends their turn after hitting a creature two or more times or critically hitting a creature.
Requirements You’re wielding a gun.
You fire a quick shot at a foe your ally is focusing their attacks on. You Aim at the creature your triggering ally hit and then make a ranged Strike against that creature.

Paizo ClarificationUnlike most effects that damage multiple creatures in an area, creatures who fail or critically fail their saving throw against an area fire or auto-fire specialty basic action are considered "hit" for purposes of reactions such as Kill Steal.