In my experience it has a use mid combat when you already have killed off few enemies. If lucky you can make the already wavering enemy flee or further decrease the morale for the debuff. If you were waiting for a 1hit flee effect well this is not it. The more hits youa re able to make a round the more opportunity you have to route your enemy. For a test all you need to do is get a guy with focus and fearsome, get tons of fatigue and chop away.
