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On reading a few of the previous comments I noticed that many were complaining that it's hard to perform a finish kill. It works fine for me. What you must be doing is that you're pressing an arrow key while jumping. Don't. Just press the jump key when you think you are close enough to a fallen enemy. Do NOT press any other key. And there you have a successfully performed finish kill. Hope this helps.
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if you jump right before the game loads you can get stuck up in the air. While in the air they still attack you and the archers can kill their own people.