Our school has three seperate drills calling them "lock-flows" where it's a series of hand, arm, head locks and counters to those locks. Each drill has 8 or 9 moves. It's a great drill and like any other the more you work it the less you have to think about the counter when someone tries to put you into a lock. Unfortunately went I first started training I tried to find reference videos on youtube and couldn't so I think it's pretty unique drill we do.