Feat Revenge of the Needle
You are proficient in the defensive style used by many Sinker duelists.
Prerequisite: Dex 13, Int 13, Combat Expertise, Dodge, Weapon Finesse, Weapon Focus (rapier)
Benefit: If you do not move (other than making a 5-ft. step) while wielding a rapier and using Combat Expertise, you gain an attack of opportunity whenever an opponent misses you in melee by 4 points or more, and the opponent is flat-footed against this attack. You can make only one such attack of opportunity per opponent in a round, even if you have the Combat Reflexes feat. Although you are restricted from actual movement, you can still take a move action and gain the benefits of this feat.
@ see Complete Warrior for more information on Style feats.