pf2e.fyi
From Pathfinder Advanced Player's Guide, which isn't enabled.

Dueling Dance (Swashbuckler)

FEAT 10
STANCESWASHBUCKLER
Activity 1 action
Prerequisites Extravagant Parry
Requirements You are wielding only a single one-handed melee weapon and have your other hand or hands free.

Using your free hand as pivot and balance, you both attack and defend with your weapon.

While you are in this stance, you constantly have the benefits of Extravagant Parry.

Pathfinder Advanced Player's GuideOGL