Jamming

Jamming is stopping an attack either by getting so close to the attacker that he or she does not have enough space to fire the attack (or not enough room to generate full power in the attack) or by using a body part to stop forward movement of the attacking limb. It takes less effort to prevent an attack from moving than it takes to stop the attack once it is moving. In addition, jamming frustrates the opponent because he or she never gets to fire the attack.