I know that the video looks kinda old and goofy but what about the concept itself? With diamond stepping the "simultaneous defense and counter" often mentioned in Okinawan Karate manuals suddenly makes perfect sense - it's not blocking and striking at the same TIME but instead it's evading/parrying and countering in the same STEP. Half step dodge / parry + half step strike / throw. The thing that also strikes me (pun not intended) is that I was taught this kind of stepping in my Shotokan / Fudokan dojo but it was never properly explained or practiced. It was supposed to give us "more balance" during movement - which is true to some extent but I feel like the main point of this diamond (or curved) stepping is moving off the centerline or even BEHIND the opponent, which is a huge advantage. What do you think? Have you been taught this? How about in other arts than Karate?