So when your opponent gets to the high crotch position, the drive leg will usually come up so that he can run double or convert to a single. This is very predictable, so that drive leg will move likely be there for you to attack. We are going to fall over the head towards the right, hooking the leg from underneath with your right arm. The right arm should be at or around the knee. Your left hand can then grab the top side of the ankle, giving you two points of control on the leg. You will then pull the ankle across your chest and roll back to your stomach. This is known as 'funking'. When you funk, there's no going back. Usually if you have to roll back in the other direction then the funk isn't working and you'll have to bail. If you commit and get height, you should be fine. When you get to your stomach you have to pull your knees up to your chest and build your base so you can go out the back door.