|The following is based on Fallout Tactics and some details might contradict canon.|
You are a half crazed feral killing machine. Crippled limbs have less effect on you and you receive bonus Action Points whenever you kill an opponent. But chems, including stimpaks, have no effect on you. Available only to deathclaws.”— In-game description
The description states that there is a bonus to action points after killing an enemy, but it is false.