The first time that you injure or are injured by an enemy in a scene, roll your Knack Skill and bank the successes. You gain access to the following Stunts for the rest of the scene, and may spend banked successes to activate them after a successful attack.
Frenzy (2 successes): You may inflict an additional injury condition. You cannot stack this with the Critical Hit Stunt. Until the end of your next turn, the Difficulty to hit you is reduced by one. This Stunt can only be bought once per fight.
Trouble the Wound (2 successes): Until the end of their next turn, the target increases their Difficulty penalty from Injury conditions by two, to a maximum of five.