Translation
The scholar who is before me speaks truly that his grip will put him on the ground or dislocate his left arm. Also I say that if the player removes his left hand from the shoulder of the master, that the master arrives at the third play similarly to how you see it drawn. So that the first play and the second are one single play where the master sends him to the ground on his face, and the third one sends his shoulders to the ground.
Interpretation
The play of the 1st scholar follows seamlessly from the master play of grappling. At the transition point between the two plays, if the opponent feels the pressure on their left arm, they can avoid the arm lock of the 1st scholar by dropping their left elbow and slipping away.
This will cause them to twist slightly clockwise. As the 2nd scholar, you want to take control of this movement and add to it.
Strike your right forearm into your opponents neck and collarbones. It will create a shock, but is not intended as an attack in its own right. With a clockwise twist of your hips, curl your right arm down and carry their head to your right hip.
Once your opponent is unbalanced, scoop your left hand under their knee. They must already be destabilised before you try this. If you go to scoop too early, not only will it be unsuccessful, but you will lose the advantage and be exposed to a counter throw.
With correct timing and having successfully caught the knee, lift it right up and step through. You will be left standing in Posta Dente di Zenghiaro with your left foot forward. Your opponent will be lying on their back to your right hand side. Be sure to strike them hard before they have the opportunity to recover.