Attacking with the armbar from technical mount is not terribly different from attacking from mount. Your opponent’s arm is just a lot farther across your body than you really need it to be, so you move your hips into position and attack. The noteworthy concept behind this attack is the idea of threatening the armbar to set up the back-take. When you achieve technical mount, your opponent knows that he is in danger of the back take and the armbar, but he cannot easily defend both. Threatening one will open up the path for the other. As you drill this back-take, pay particular attention to the movement of your shoulders. As you can see in the animations below, my shoulder blades never actually touch the mat. If you roll your back across the mat, you will likely lose position, so focus instead on pivoting on your hips as you transition.