Other rock patterns could also be applied at the cross, as shown in the following clip.
The man then uses a right-left-turn rock pattern: (1) steps diagonally forward to the right with his right leg while turns his upper body 90 degree to the right to lead her right leg pivot 180 degree and her left leg step on his right, (2) pivots 90 degree to the left with his right leg while transfer weight to his left leg to lead her transfer weight to her right leg, (3) continues the pivot with his left leg to lead her left leg to step forward and pivot 180 degree to face him, while he collects and changes weight to his right leg. The woman uses a left-right-forward rock pattern: (1) pivots 180 degree on her right leg to let her left leg to step on his right, (2) transfers weight back to her right leg, (3) steps forward with her left leg and pivots 180 degree counterclockwise to face him. Notice the dissociation of her upper body and lower body when she walks back and forth on the side of him. The whole sequence is another creative variation of ocho cortado.
The couple further exploit rock patterns in another video.
Rock steps are featured steps of tango milonguero that contribute to the simple, compact, rhythmic and elegant style of the dance. The patterns described above are examples in a pool of rock patterns commonly used by the milongueros. Familiarizing yourself with these patterns can help you improve your tango.