If your opponent manages to sit up in the Butterfly guard to set up the sweep grab their belt with your hand on the side they have an underhook and block their bicep on the side they are controlling your arm. As they go to sweep you post your hand on the mat and lift the hooked leg and then drop your leg bringing your knee between your opponent’s legs. Bring your head next to your opponents head and control their arm at the elbow. Circle your leg to the other side and walk to the back until you can grab around your opponents head. Finish the pass by shifting your hips, using your hand to block their hip and shifting your hips back to establish side control.