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2 Mithun.
I checked, and it's true, even when playing a duel with Ossir. A successful attack from a sworn enemy is approximately 3.5 times stronger than a normal attack, so it doesn't work at full strength, but it does work.
By the way, the maximum chance of the "Sworn Enemy" ability triggering is 60%, because you can improve the guild in the city, which gives +10% to the existing 40%, and there is also an ability in the Education skill line called "Know Your Enemy," which gives +10%. So, life isn't easy for the sworn enemy.