Pack Hunter Block

Pack-Hunter Block (Combat)
When the waves of infidels come, you will be ready.
Requirements: Shield Focus, anpur, base attack bonus +6,
Benefit: When using a two-handed weapon or a shield, you may cancel one of your next iterative attacks to negate an attack of opportunity against yourself or an adjacent ally.

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(BAB +8): You may make an immediate counterattack against a creature whose attack of opportunity you have blocked. This counts an an attack of opportunity for you.