By threatening the cross choke opportunity opens up for the scissor sweep. The threat of submission from closed guard keeps you two steps ahead of your opponent because before they can address opening the guard, the choke has to be defended first.
Matt Darcy goes in depth and demonstrates how to complete a pendulum sweep attempt when your opponent drop their elbow belt line to cut off the sleeve drag and access to their back.
Matt Darcy teaches how to re pendulum someone who initially defends it and adds and option for a sit up triangle choke
Matt Darcy shows how to use the threat of the Pendulum sweep to transition to an armbar.