I was watching the winner of one of those freestyle competitions talk about her worries and thinking leading up to the competition; she repeatedly referred to extending her legs then bending them to absorb the impact of landing on her feet as 'putting it down'.
I understood it differently then; after bending the knees, twisting the hips, spreading the legs, doing 360s, etc there was a moment to put her feet DOWN, stomp them, to make the right kind of contact with the snow.
I remember a guy hucking, landing on his feet, going forward and striking his chest on the snow, and dying on the spot a few years ago. Your skis slow down abruptly; your upper body continues at free fall speed.
I find it dangerous when I've only had a few feet of air under my skis, which is why I do it. I understand why those guys do it with a few hundred feet of air.