Combat Reflexes

You can respond quickly and repeatedly to opponents who let their guard down.
Benefit: The maximum number of attacks of opportunity the character may make each round is equal to the character’s Dexterity modifier + 1. For example, a character with Dexterity of 15 (modifier +2) can make three attacks of opportunity in a round. If four thugs move through the character’s threatened area, he or she can make attacks of opportunity against three of the four. The character can still only make one attack of opportunity on a single opponent.
With this feat, the character may also make attacks of opportunity when flat-footed.
Normal: A character without the Combat Reflexes feat can make only one attack of opportunity per round and can’t make attacks of opportunity when flat-footed.
Special: The Combat Reflexes feat doesn’t allow a Fast hero with the opportunist talent to use that talent more than once per round.