How do Sword Dance stacks affect Thornblade?

Thornblade delivers its basic attacks through a three-hit melee barrage.

Consuming the buff amplifies that strike sequence during close-quarters combat. When controlling Thornblade directly in Twine Mode, that basic attack string pairs alongside two active skills and an evasive maneuver. In Command Mode, Thornblade executes its basic attacks and expends stacks while attacking automatically under your orders.

Formblade also relies on this mechanic, consuming Sword Dance stacks to boost the power of its own basic attacks.