Leap is bugged as seen on the video. (Z Axis) & you can take fall damage out of it.
Also you can get cc-ed as soon as you land it, couldn't manage to reproduce it, but you can get CC in flight/just before you land. I'll let the tests for ZOS (:
Edited by Skysenzz on May 29, 2019 11:02AM
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Yep it looks like your leap "landed" while 20m in the air, after reaching the enemy on X/Y axis, but not Z axis, at which point the skill stopped, and you started falling (and hence took fall damage)