Translation
Another sword disarm you can do when you are crossed in narrow play is the scholar puts his right hand under his own blade and takes that of the player almost at the middle, keeping it upright, and immediately lets his own sword fall to the ground. And with the left hand take hold below the pommel of the players sword and give it a turn round to the players left. And immediately the player will have lost his sword.
Interpretation
The last of the narrow play disarms applies similar mechanics to its predecessors. From the crossing of the 3rd master, roll the pommel of your sword over your opponents right hand as if making the pommel strike of the 3rd scholar of the 3rd master. Step through with your left foot as you do so. This will force your opponent to draw their arms back and raise their sword to a vertical position to stop the pommel strike. The blade of their sword will be pushing against the handle of your, between your hands.
As your hands are very close to your opponents weapon, and your attack will not work, you change your strike to a disarm. Roll your right hand underneath your own blade to catch your opponents. With your left hand, drop your sword completely, and grab your opponents pommel. This is the point shown in the picture.
Twist the sword clockwise in the vertical plane and your hips clockwise in the horizontal plane. Your opponents wrists will lock up and the sword will be stripped from their grasp. When you slide your right hand to take a proper grip on the handle, you will be in posta coda longa.
Adjust your left foot for distancing and deliver a cut or thrust to your weaponless and troubled opponent.