Agile Riposte

The character has learned to strike when her opponent is most vulnerable—at the instant her opponent strikes at her.
Prerequisites: Dexterity 13, Dodge.
Benefit: Once per round, if an opponent makes a mêlée attack or mêlée touch attack against the character and misses, the character may make an attack of opportunity with a mêlée weapon against that opponent. Resolve and apply the effects from both attacks simultaneously.
Even a character with the Combat Reflexes feat can’t use the Agile Riposte feat more than once per round. This feat does not grant more attacks of opportunity than the character is normally allowed in a round.