From side control when someone has their forearm posted on my throat. With my underhooking hand I push the elbow across their body and trap it against their head like an arm triangle. I take out his lapel and pass it to my crossface hand. From there I mount and loosen my grip on the lapel as I move to S mount I loosen my grip on the lapel so that I can bring my forearm against their neck. From S mount I fall to my side and push their arm across their body to finish the brabo choke.