Because of the hold I have earned, and the way I lift you from the ground, I will lift you with my strength and put you under my feet, first with your head and then your body. And you will not see a counter to this.
This play appears in both the Pisani Dossi and the Florius manuscripts. As can be seen below, both these other documents show the throw being performed on the right leg, instead of the left, as shown in the Getty. It makes more sense to throw the right leg.
From the master play, you will have contact with the inside of your opponents right elbow. Drop your weight onto your back foot to disengage from your opponent. As you do so, slide your hand down their forearm and grab onto your opponents right wrist. Pull them forward off balance. You need them to take a step forward. With your weight on your back leg, swing your foot around your opponent to their right side.
Place your foot in between your opponents. Get it right up close to the inside of their right foot. Bend your knee and sink your weight low in your front foot. The back and forward motion will create the momentum you need to smoothly lift your left hand up, putting your opponents arm across the back of your shoulders. Scoop your right hand under their thigh as shown in the Pisani Dossi or Florius manuscripts.
Straighten your legs and bend at the waist. The combination of your straightening leg and the thigh lift, will pick their right leg up and throw them off balance. Your opponent will fall backwards, landing in front of you. As you have bent over, their right arm will slide over the top of your head. Since you control the wrist, you will be able to pull on it, causing them to spin on their back slightly. You can now safely lock the wrist and finish your opponent with the remainder of Fiores five things.