Confounding Tumble Deed

Panache

You can befuddle a foe by striking a blow after tumbling.

Prerequisite: Amateur Swashbuckler† feat or panache† class feature, Canny Tumble†, Acrobatics 7 ranks.

Benefit: When you use Acrobatics to move through an opponent’s threatened area or space without provoking an attack of opportunity from that opponent and then hit that foe with a melee attack in the same round, as a free action you can spend 1 panache point to deny that foe its Dexterity bonus to its Armor Class until the end of your next turn.

Source: Advanced Class Guide