Accelerated Probability (D20 Modern Skill)
From D&D Wiki
 Accelerated Probability (Dex; Armor Penalty; Trained Only; Power)
Check: Using this skill a character can predict the outcome of most situations. The character can make a re-roll on any roll that deals with physical movement and has a consequence to the result. A Reflex save or Balance checks are both examples of rolls that you may use this skill with. When the reroll is made the check result determines which of the two rolls are taken.
|Reroll Taken||Check DC|
|The reroll is taken even if worse||10|
|The better of the two rolls is taken||20|
Try Again?: No, a character has only one chance to make the reroll with any one use of a saving throw or skill.
Time: Using this skill takes a swift action as a reaction to another skill or saving throw.