2 Part Lesson -- Marcelo explains the reason to force a Arm-In North/South Choke when an opponent captures his left arm; in addition, he reveals how to thrust away obstructions against his neck: Primarily, the North/South-Choke is a submission initiated from Side-Control, where an opponent is less likely to realize your intentions (especially in the gi). However, the choke can also be entered from any number of configurations involving their arms in and/or out of your clinch from the traditional North/South-Position (a.k.a. Kamishihogatame, Inverted Open-Mount, 69-Position, et al.). When holding your opponent down with Double-Overhooks, you will typically have unhindered access to their head and neck, but at the cost of greater instability and at the risk of potential counter back-taking opportunities, e.g. Skinning-the-Cat. Holding your opponent down with Over/Under-Control from North/South is much more stable, but you may have difficulty pummeling your Under-Hook out and connecting your hands together for the classical naked finish. If their elbow is low enough, you can use your same-side knee to scrape down their arm and free your hand for a Gable-Grip finish. If you cannot pummel, connect your hands together with a Seatbelt-Grip and slide yourself more North for the tap-out. [6:08] If your opponent connects their hands together underneath your chin, nontelegraphically swat away their forearm to the side and turn your face away from their armpit as you reconnect your hands and apply pressure.