In recent years we have learnt that to understand our style thoroughly we have to go beyond our style; but in so doing we can find the effective self defence principles that were there all along. So practitioners of karate, tae kwon do, kung fu and so on are realizing that their kata and even basic kihon can make sense as self defence -in a way they never did as "traditionally" taught - if we have the eyes to see what they could be. Because at this stage in the evolution of our arts this is largely a process of reverse engineering, the sticking point is having the range of conceptual tools to see what the moves could be. Having trained with Rick Clark regularly on his seminars in the UK, I was always struck by how someone could show him some piece of kata from their style, and Rick could see immediately a number of interesting and worthwhile applications. He has taken that vision of his and inspected one of the most basic movements in many styles - the down block. What comes out is a wealth of ideas - just the inspiration the modern practitioner needs to understand his art. Any one person should reject many of the ideas and accept only a few for regular training, so that what they take fits in most coherently with what else they use for other movements in their kata etc. But each student will select something different, and so seeing a wide range of possiblities is invaluable for guiding one to create one's own personal self defence system. Presented here are many principles of jujutsu, arnis and kyusho jutsu applied to a simple move of karate, illustrating the fundamental unity of all styles. It's a book I will return to many times.