This technique is used when your attacker applies a rear naked choke.
Your attacker has their right arm round the front of your neck and is applying the choke.
Grab their arm with both hands to release the choke slightly.
Go down on your right knee and place your right foot on the outside of your attackers right foot.
Keep hold of the attackers right arm (the one choking you) with your right hand. Place your left hand on the front of their left shin.
To throw your attacker, take your head down to your left knee and push backwards with your left hand.
Grab your attackers hand right hand with your left hand. Your thumb should be under their wrist.
Take your right hand under your attackers right arm and grab your left wrist as shown.
Put your left knee down on your attackers neck and pull up with your hands to apply a wrist lock.