Looks like a way to Emerson Wave your thumb studded knife.
https://jerkingthetrigger.com/2020/...-opener-to-almost-any-knife-with-thumb-studs/
https://www.snaggletoothmf.com/
https://jerkingthetrigger.com/2020/...-opener-to-almost-any-knife-with-thumb-studs/
https://www.snaggletoothmf.com/