This is one of those tricky “junk-jitsu” submissions that actually requires you to do something we’re strongly discouraged to do in BJJ: expose your back to your opponent. Somewhat related to the way we manage the threat when we do knee-bars or toe-holds, we focus our weight toward the break rather than towards the choke. We threaten a break on a long bone (the shin) rather than a joint. When breaks do occur, it is VERY QUICK. So a great deal of caution and non-ego has to be used when training these. Not super high-percentage per se, but definitely a tool for the toolset.