Dual Strike
( Sword and Fist: A Guidebook to Monks and Fighters, p. 6)[General]
Your combat teamwork makes you a more dangerous foe.
Prerequisite
Combat Reflexes (PH) , Base attack bonus +3,
Benefit
If you and an ally both have this feat and are flanking an opponent, you both get a +4 bonus on your attack roll.
Normal
The standard flanking attack roll bonus is +2.