This video looks at some aspects of the clinch bunkai of Naihanchi / Tekki. It was filmed at a three-day seminar in North Carolina in December 2014. As is always the case with these short videos, it can’t possibly capture the whole methodology and needs to be viewed on that basis. The seminar covered many other clinch techniques and related live drills, of which this clip was part.
If you would like to know more about this aspect of Naihanchi / Tekki Shodan then I would direct you towards the DVD “Beyond Bunkai” which covers the related unscripted, semi-live drills for the kata.