There isn’t much that’s more common to see in Jiu-Jitsu than fighters turning on all fours as their guard is getting passed, to avoid getting stuck in side-control—and in championships, to not give up three points.
Balled up on his knees, the opponent defends as best he can. In the following video, MG team black belt Hugo Botelho demonstrates a trick to snagging a turtling opponent. As Hugo explains, post a hand on their back and do a spin. Your opponent will get choked with the help of the collar.