Grim Reaper's Sprint

 is a Fallout 3 Perk.

Bugs

 * Xbox360, though not a painful bug, occasionally players who selected grim reaper's sprint in a previous game may continue to see its effects in a new game until restarting or manually resetting the console's cache. This bug doesn't appear in the PS3 version.


 * Sometimes, though a very, very, rare glitch, when you kill 2 people in VATS, upon exiting and re-entering vats with another NPC you will notice your AP doubled. This has only been reported once in an instance when two raiders were killed.