A kinetic opening. Using an object other than the knife hand to open the blade(i.e.-leveraging the blade against your wrist or an opponents wrist/arm/etc to cause the blade to open.
To show a different example, see how the Emerson wave device causes the blade to catch on the pants pocket and open on draw.
The Guntings blade "horn" lets you do this on a much broader spectrum of things, aside from your pants.
Now, that said, I've heard, and advise, never to use a larger object(i.e.-your own leg) to do a Kin-Op, as the blade may embed itself and this will prove my "point" not to do such things.
If I seem a little crazy, it's 'cuz I just may be, just waiting for the test results...lol.
Later
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Sean
If you find you must throw something at me, please make it a custom.
"May your blade chip and shatter"- Dune Fremen fighting saying