ah ok, tried it a few times but don't feel there are very much benefits from this type of opening over the "traditional" kind with the thumb. I might be able to open it faster, but i loose time gripping the knife.
back in the day, Spyderco used to show this as the way to open them, with a section of the catalog devoted to it. Most people seem to have transitioned to thumb opening them instead, but the method is still valid.
Its all fun and games til somebody loses an eye, then its fun and games you can't see.
I think it works better with the non-FRN models, like Stainless Steel, G10 with liners, etc. They have extra weight which helps it out. I maybe wrong, but it seem like just a physics thing.
It also works better with linerlocks than lockbacks. The friction of the backspring makes it harder with lockbacks, but it can be done. I can even do it with an FRN Ladybug with enough snap of the wrist.
I have attempted to draw my Paramilitary by the spyder hole to do a Spyder Drop open but the blade opens in my pocket, so I didn't get very far with it.