This book is pure suicide instruction. In one of many terrible examples, it is axiomatic that you never try to kick the edged weapon out of the assailant's hand. Not only does that expose your groin and femoral artery (cripple and kill targets respectively) but any decent knife fighter may also slice your achilles tendon. The book does not address the pre-attack phase, the use of force continuum, the context of passing, jamming, trapping, redirection, structural attacks, overcoming fear, the OODA loop, facing the pain-immune assailant, multiple assailants, hands slippery from blood, sweat, etc., adjusting to clothing and terrain; or any of the dozens of additional basics needed for a decent discussion of this topic.
Edged weapons response requires a comprehensive approach dealing with the pre-attack, attack and post attack phases. The legal use of force issues must be addressed along with how personal and environmental attributes will affect the course of combat. This book deals with few if any of these issues and is a result of the type of martial artist who confuses a martial art that may be competent in dealing with unarmed attackers with one that can deal with proficient edged weapons users under real life conditions.
If you desire to learn how to defend against a Hapkido assailant who attacks you with a weapon unlike how someone on the street will; wearing martial arts uniforms and bare feet under perfect battle conditions (lighting, terrain, etc.) then this book is for you. If you desire to understand how to properly learn how to defend yourself against an edged weapon assailant; then become an instructor in an Asian Archipelago martial art and then constantly practice reality based training scenarios wearing training suits, using the ShocKnife, marking blades and video analysis. An emphasis on the legal use of force will reduce the possibility of going to jail and education and training in the pre-attack mode is also critical. A few other combat systems that excel in the offensive use of close range small edged weapons may also be helpful (Ninjutsu, Wing Chun, etc.).