Overwatch Vortex (Combat)Source Weapon Master's Handbook pg. 15
You are ready to respond to many more of your foes’ actions.
Prerequisites: Overwatch Style, Overwatch Tactician, Precise Shot, Rapid Shot, Weapon Focus with the chosen weapon, base attack bonus +11.
Benefit: While using the Overwatch Style, as a full-round action you can ready up to four ranged attacks, each with its own triggering event. You take a –2 penalty on attack rolls made with these readied actions.