Grim Reaper's Sprint

Grim Reaper's Sprint is a perk in Fallout 3, Fallout: New Vegas and Fallout 4.

Fallout 3
Landing a killing blow in V.A.T.S. will immediately restore all Action Points, allowing the beginning of a new series of attacks immediately. However, foes killed by allies (or other means) will not trigger the perk, even while in V.A.T.S.

Fallout: New Vegas
In Fallout: New Vegas, the perk only gives back 20 AP on a kill in V.A.T.S. Although this is a significant reduction to the effectiveness of the perk, the perk is still very useful with high power, low AP cost weapons. The effectiveness of Grim Reaper's Sprint is dependent upon three things: AP cost of the weapon, damage of the weapon, and toughness of the enemy.

Be aware that the perk restores 20 Action Points if an enemy is killed in V.A.T.S., not per enemy killed; e.g. killing 3 weakened enemies in a single round of V.A.T.S. will only restore 20 AP, not 60.

The following perks and traits complement Grim Reaper's Sprint: Fast Shot, Kamikaze, Action Boy, Math Wrath, and Better Criticals.

Behind the scenes
The perk is a winner of Bethesda's Fallout anniversary contest, submitted by Marc-Andre Deslongchamps.

Bugs
Sometimes upon taking this perk, it will not restore AP. Instead, it just takes up a perk slot that could have otherwise been used on something else.

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