caswell karambit?

I've looked at this knife a bit and am really intrigued by it. I'm a mechanical engineer, so the 4-bar linkage mechanism is fascinating to me.

Then I saw the way he disengaged the lock, needing both hands... Would like to know if that's necessary or if it was just him carefully showing where/how the lock is for the video. If it is necessary to use two hands to close the knife I wouldn't be interested.
 
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