As I did the research for Longhurst – A simple wristlock I stumbled across this simple wrist lock. The lock starts when the assailant grabs the defendant’s wrist crosswise.
The defendant holds the assailant’s fingers in place with the free hand, and then snakes the fingers of the held arm over and around the assailant’s lower arm, ‘rolling’ it towards himself
The video then proceeds into a second hold and a throw, these were not tried in the session.
The study group first tried this on 2016-09-11.