Slide forward while performing a left wauke and follow with a double bushiken strike. All three blocks are just moving versions of the waukes in sanchin kata. Notice that between 8 and 9, and between 9 and 10, your front hand is held low and your rear hand held high. As your rear hand performs the wauke, it needs to drop and the front hand needs to rise. This is great for throws if someone is off balance or if you grab a kick with a low block and a shoulder with your high hand.
Rotation effects a throw to the ground, head first.
Left wauke while stepping into a right sanchin, drawing your right hand up for a shuto strike followed by an ura uchi, just as in hojo undo. Ask a senior student to show you the opening of Seiru for another way to do this. Sanchin turn to north. Left wauke and left shomen geri. A swift pivot to the right would bring your left shoulder into the elbow and snap it.