This Choke is very sneaky in the fact that your opponent has you in a Choke but in reality you are putting them unconscious. It is a great counter to the submission and can be hit from side control, half Guard, or the closed Guard.
Really the key is to put an immense amount of pressure down on the side of the neck. At the same time you wanna focus on going over top of their wrist to insure they will not escape. It locks their hands in place making it difficult to tap sometimes so be aware of your partners well being.