This is the counter to the previous play and it goes like this. Use this counter with such a hold as soon as you are grabbed from behind. You must immediately switch hands on the reins, and take him with your left arm in this way.
The 1st scholar of horsback grappling has come from behind and is attempting to pull you back and to your left off the horse.
As you notice them approach, use your right hand to simultaneously hold the reins and take a firm grip on the pommel. Timing is important here. You want to catch your opponent just as they are fully stretched reaching out, but before they have taken a good grip.
Turn quickly to the left. lifting your elbow as high as possible and moving back in a circle. You are aiming to pin your opponents hand against your back to act as the fulcrum of a third class lever. Ideally, you want to catch their arm at or above their elbow. The higher up their arm you can apply pressure, the greater your chances of success.
With your left arm, grab onto your saddles pommel, your belt, or anything you can use to lock your arm tight against your body. Turn your body and horse to the right as you do so. If your horses rump pushes into the shoulder of your opponents horse, all the better.
You are levering your opponent out of their saddle forward and to the right. Be sure to keep in front of them at all times and keep your arm locked tightly to your body. This will prevent them twisting out of your hold. With the massive force that horses provide, you will shatter your opponents elbow as you drag them from their horse.