At the same time, you are controlling your opponent but you are also are putting lot of pressure and can set up for many submissions and even a transition to mount.
Knee on the belly could also be use for striking if needed to and also you are keeping a more upright position which more ideal in a self defense point of view.
Serge taught knee on the belly, escape and 3 submissions to the beginners while Stu taught Triangle and Triangle defense.
Next week is North South position.
See you on the mats.