How to unlock Oni's sword throwing ability?

I saw that he can do that. I was with my cute Bill, repairing my lovely gens when Oni started to chase me, than injured me and i just: "Haha, i have resilience and spine chill, you will have hard times Mister." Than i just fast vaulted to show him who is the boss, runned 2-3 m from the window, and BOOM!! he downed me 2-3 metres away, from the other side of the window.... he was the boss.... As a hardcore killer main i NEED TO KNOW how to unlock this sword throwing ability at Oni, because it would help me hunt down survivors a lot, i wanted to ask him how he unlocked it at the endgame chat but he dont responded so i ask you guys: HOW TO UNLOCK ONI'S SWORD THROWING ABILITY?

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