Probably the same action as mine (Mini Barrage). They use this type ("Assisted opening Axis lock") on several models... the Barrage, Arcane, Volli, Emissary, and maybe others I'm not familiar with. It WORKS, and locks utterly tight with NO play.
Whatever it was, you moved the blade a tiny, TINY bit and WHACK! Out she was.
People who say it can't be done should not interrupt those who are doing it.
When you're used to opening a Spyderco all the way with your thumb, the same motion causes the blade to shoot out to full-open, overshooting the thumb, which continues its normal arc. I pretty much always end up "checking the edge" on such knives, which is only something I want to do when actually checking the edge.
A few guys I know have spring assists. True switchblades of any significant size are not real popular here in CA as they are restricted to LE only, and LE probably doesn't buy a lot of them simply due to limited retail exposure. At the point you can get the knife open quickly with one hand though, what's the reason for the extra moving parts?
I am not an LEO, nor have I trained with a knife, but I figure for me getting a folder open under duress is going to be easier with an assisted opener, once it is open, I do know my anatomy. Thanks again, I started the thread because I do not know what works for an LEO on a daily basis.
I take no pleasure in the death of the wicked, but rather that they turn away from their ways and live. Eze 33:11