How to defend against knife attacks... or not. (Which knife defense techniques actually work?)

Free course: The vast majority of knife defense techniques are bizarrely ridiculous, and will usually leave you filled with holes... which is crazy. Who would teach a method of defending against knife attacks without actually TESTING it?! And yet, the Bullshido persists, throughout some of the most popular knife defense styles in the world... like Kali, Pekiti Tirsia, Krav Maga, Systema, and just about every other style that I researched and