Here is another attack using the same sneaky Americana I've been using from under the head. In this example, we go from the Ezekiel Choke and our opponent defends it. Because my weight is side shifted, my savvy friend will feel my opposite leg go light, and try to push my knee into half guard to gain a better position. 

Rather than stay there and let them get half guard, we skip over to position 2 of Side Control. Now they defend the position by trying to build a frame. This presents the arm in a vulnerable position to grab it from...