Many styles use this movement for blocking an attack to the top of the head. In this video you will see a different perspective, and this is just one of the many. The biggest key is to look outside the box at movements and look at EVERY part of the move.
Here we demonstrate how to transition from the centerlock to the "S" lock using Kyusho principles and points. This is a common technique in many different styles, this one has its foundation in Small Circle Jujitsu. Click on the pics to see the video.