I think underaged may be right. I looked at pbase.com/haveblue/root, a collection of Benchmades, and believe only the 805 and 806 are configurable for tip down.
I have tried this on mine, and found it ackward.
I wasn't comfortable with tip up myself, but I've adjusted.
I did drop the knives onto a carpeted floor a few times to test if they opened, though.The axis knives seem well biased to stay closed, unlike most liner locks I've examined.