Trigger Rush

Trigger Rush is a companion perk in Fallout 4.

Obtaining
To gain the perk, the Sole Survivor must be at maximum affinity with Cait, which is possible after completing her personal quest, Benign Intervention.

Effects
The official description in game states the player character's Action Points regenerate +25% faster, if the Hit Points value is below 25% of its maximum. In game, when the player character's Action Points are below 25 points, their action points regenerate 50% faster.

Behind the scenes
In the animation for this perk, Cait fires her pistol in time to the common Morse code signal "SOS".