Knife is one of the most common weapon  use by aggressors in the street. A Knife is a extremely dangerous weapon because it is easy to handle, so stabs and slashes can be done in a very fast motion. As much as possible a defender should use objects to protect himself against the knife attacks. Common objects such as bags, chairs,  even a laptop computer can be use as a shield to protect oneself against knife attack and increase the chance of survival. The shield is usually held with 2 hands to block the attack therefore counterattacks shall be done with kicks; to the groin, to the knees or to the abdomen. 
This short video displays the drill that we practiced Thursday night to summarize the class on this subject. This drill is effective, fun, exiting and exhausting.