User blog comment:Redkite/Season 2, Battle 4, Snake-Eyes vs. Deadpool/@comment-4552610-20130107020328/@comment-4844014-20130108170851

Ah. Allow me to elaborate to help you. The defensive hack is a specific section of the knife where the blade is rugged. This is so in the event of a knife fight bewteen two opponents, the one wielding the knife will be able to counter his foes attack and damage there blade by raising the knife to catch the foe's slash in the hack, this will damage the opponents blade and in some cases, expert knife users like Special Forces units have been taugh to use the hack to catch the blade then try and disarm them from the blade all together. The hack is a very effective tool common on many military grade knives today as they can aid the user in being victorious in a knife fight where only training and the reliability of the blade can be the winning factor.