You begin with the opponent in your closed guard. Their right hand in holding both lapels near your midsection, and has their left hand on your right sleeve. This is the grip to the basic standup pass that JG and Sazinho show.
A common tactic would be to try to secure the right arm – but it is anchored with its grip and being held strong. An easier route is to leave the right alone and attack the left which is more “floating” than the right.
Your left hand comes to the sleeve of their left hand. You pull explosively toward the archer position with the left, and you punch your right away from you, toward or past their hip. This is the break their grip on your right sleeve.
Once that grip is broken, the left hand grip stays and the free right hand goes behind their elbow and grips the gi on their tricep. You keep that arm “floating” – you never let them grip you anywhere with that left hand. You can elevate it or pull it to the right or pull it toward or past your head… but you never let them grab you (which would immobilize that arm – you need it free.)
You pull and punch that left arm toward their right side, which would usually create the arm across position (where you get your chest at their shoulder and grab around their back and to their lat/under their armpit.) For the purpose of this move, we commit less to that arm across move because we want them to square back up / get that arm back to neutral.
When the do so, we lace our right hand inside the crook of the elbow and through to behind their neck on the same side collar. Our elbow must be higher than theirs (closer too their bicep/shoulder) in order to have control/dominance over their arm. If our elbow is too low, they can collapse the arm / keep it tight to their body where they are strong.
With a strong stambowsky grip, you shrimp (probably easiest to drop your right foot to the floor to begin the shrimp) and get both feet on the hips. Then you pressure into their hips while pulling strong on the archer grip and while shoulder walking away from them. You continue until they are in a “table” position – their hips are back far and their upper body is forward, their back it flat, parallel to the ground – then you throw your left leg over to begin the triangle.
After your left leg goes over, your right hand can leave the collar grip and grab your shin and ankle. Your right leg locks the triangle. Now your left can drop the sleeve grip and secure the head. Next your right can let go of the shin and slip out from between the head and arm. Your right next collapses the arm and elbow across to finish the triangle position. Last you squeeze knees together, pull head down and hip up to complete the triangle.
When throwing the leg over, Jon says you can try to reach your foot to the floor in order to help get yourself into the right position if you have short legs.