Your off handed blade flashes beyond perception when enemies slide past.

Prerequisite(s): Off-Handed Opportunity, bab +11

Benefit(s): You can take up to one extra attack of opportunity with your off handed weapon per opponent that passes through your threatened area for a number of total attacks equal to your Dexterity bonus per round. Normal penalties for attacking with the off handed weapon apply, using your highest base attack bonus for each attack.