Combat Reflexes

The character can make additional attacks of opportunity.
Benefit: The character may make a number of additional attacks of opportunity per round equal to her Dexterity modifier. 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.