This is an important thing for Knuckle users to know, especially if you have Crescent Kick and Dragon Kick. :3
It's almost a complete double jump with these two skills. Actually, about 1.75 jumps.
It also covers more distance if you're running beforehand and if you wait half a second before using Dragon Kick(since you rise up and keep moving before descent.).
Also, if you have any skills that can hit above you and knock an enemy in the air, this can be useful for snatching extra monsters from platforms above you. I always nabbed extra skeletons in the Pyramid room by Crescent Kicking them down when they were standing right on the edge. :3