Vicious Attack [Fighter][General]
You are able to make extra attacks against enemies when you score critical hits on them.
Prerequisite
Combat Rreflexes, base attack bonus +8.
Benefit
Once per round, if you score a critical hit while in melee combat with an opponent, you may make an attack of opportunity against that opponent. This attack uses the same attack bonus as the critical hit and counts toward your total number of attacks of opportunity for the round.
Special
A fighter may select Vicious Attack as one of his fighter bonus feats.