How to kill from above

How to kill from above - Top view of slogan Stop Killing Us on surface of square blackboard on black background

I just got Assassins Creed: Rogue on Steam, and I am stuck on Hope's lesson. I can complete it except for the "attack from above" part. How am I supposed to do that? Whenever I try to jump and attack, either nothing happens (timed wrong or something), or I land, then attack. Thanks!

assassins-creed-rogue

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Assassin's Creed Rogue Hope Lesson

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