Figure need a new one.
I got an OTF Lightening II knife.
After tinkering around for a few weeks with it, I did notice if you stop the blade from coming out, you will have a "dead blade". This means that you cannot use it. The blade will not lock into place, but instead go back and forth inside the handle.
Why this is important, like a pistol, if you push the pistol against someone, say during a struggle, and the slide moves back slightly, the gun won't fire. My VP9, all it takes is about 1mm of slide movement for the gun to not work. So, if you were to open the OTF knife in the same manner, the blade won't extend.
How to solve this, you have to pull the blade out with your other hand and lock it in the open position. This means it takes 2 hands. Compared to a regular folding knife that doesn't open all the way for X reason, you can just flick your wrist again or use your thumb to finish the opening movement.
The force that is used to open this knife is strong. I would estimate that against direct skin contact with no clothes, it would penetrate the skin about 1/3 an inch. This isn't enough to do major damage, unless it's over an artery.