The Americana or figure-4 armlock is usually thought of being a technique you use from mount or side mount. But here Marcio Feitosa uses it to finish an opponent in the half guard…
Marcio (dark gi) is pinning Marco (white gi) in the half guard, crossfacing him with his left arm and bringing his left knee up under Marco’s armpit.
Marco attempts to escape by framing his arms and pushing Marcio’s face.
Marcio wraps his right arm around Marco’s left arm, gripping his own gi if he is wearing one.
He now grips Marco’s wrist…
…and twists to his right to bring the arm into a vulnerable position
Marcio finishes the ‘Americana’ armlock by dropping his own head and lifting his opponent’s elbow, forcing his opponent to submit.