The armbar from turtle is yet another example of using the threat of back control to set up an armbar, and it clearly enters the spin-under sweep transition at its midpoint. Typically, this entry is easiest to use if your leg is across your opponent’s beltline. As you learn this technique, pay careful attention to the trajectory of the leg that goes over my opponent’s back. Notice how I hook the back of Darryl’s head with my foot rather than setting the leg in front of his face. You could dig to get your leg in front of his face, but diving right into the spin-under sweep by hooking your foot behind your opponent’s head is your better option. It helps to keep the armbar tighter, and it immediately forces your opponent to think about two problems at once: the sweep and the submission.