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If you lean back at all you'll backslap if you're hucking to flat.
Try to hold a position as if you're seated (without a chair) and have someone throw you a medicine ball. See if you can catch it without falling on your ass.
Then try again with your weight slightly forward. Easy.
Heavy head, stomp like a thug, ride out. If you try to take the impact solely in your quads (weight back) you'll backslap every time.
The majority of ACL injuries to skiers are caused by what's known as "phantom foot" or, in plainer terms, a backwards twisting fall. Basically backslapping and catching an edge at the same time.
To put your tails down first, bearing in mind that we're landing on a pretty much flat surface, means you would have to either flex your boots (which you can't as there's nothing to flex them against) or straighten your legs and draw your thighs up. This will isolate the load onto your quads and result in some sweet backslap action and a higher chance of popping your ACL. If you fall forwards you have virtually no chance of doing an ACL.