This video was filmed at my home dojo and shows bunkai, and a corresponding pad drill, for the opening sequence of Naihanchi (Tekki Shodan). The initial raising of the arms is a “default cover” before we crash in and clinch to prevent further strikes landing. The pushing down of the arms is the neck crank to facilitate quick escape. If that does not work, then we use the side-to-side head turns (which are not in all version of the kata, but are in ours) to limit the enemy’s ability to bite. We then maintain a tactile awareness of the enemy’s head while we clear a path for the elbows.