Krav Maga On the Edge Fitness DVD On The Edge: Defending Against Common Knife Attacks DVD. Knife attacks are lightning fast and brutal. With the advent of tougher sentencing laws for gun-related crimes, the use of edged weapons in violent assaults is increasingly common. This video will teach you Krav Maga techniques to respond to knife attacks delivered from a distance, close range and from a variety of angles. Features knife defense, counterattack and disarming techniques.