pf2e.fyi
From Pathfinder Lost Omens Shining Kingdoms, which isn't enabled.

Protective Strike

FEAT 10
ARCHETYPE
Activity reaction
Archetype Ulfen Guard
Prerequisites Ulfen Guard Dedication
Trigger A creature moves adjacent to or attempts a melee Strike against your designated ally.

You keep harm at bay. Make a melee Strike against the triggering creature. On a critical success, you interrupt the triggering action.

Pathfinder Lost Omens Shining KingdomsORC