Krav Maga has developped a drill for knife defense called the 360 defense. It is a defense against a relatively close attack. In this video, the host explains how to defend yourself against an attack coming from the top. It actually also works with a movement coming from the sides, bottom to top (targeting your belly) or top to bottom (targeting your head or upper chest) and that’s where the name of 360 defense comes from. The principle is simple. You want to perform a block on the arm holding the knife and at the same time punching him in his face. What follows it up to you.