Low Block is a key skill is in Taekwondo Poomsae and Karate Kata. However, the true intent, interpretation and application (Kor: Hae Sul, Jap: Bunkai) is not clearly understood by modern practitioners. Hae Sul/Bunkai is explored through researching its historical usage. This instructional piece was filmed during one of my classes on Poomsae. Though the film quality is marginal, I believe that the information presented is worth viewing. Feedback is welcomed.