Axes cleavers and machetes. They sometimes run into a room full of people and do it. At the moment of the attack many people just freeze between fight or flight. The woman who got her arms cut up, she froze. They wait for the mind to analyze whats happening before reacting. Big advantage for the attacker. He screams suddenly during the attack to panic the victim. People are trained by society not to react in time. They avoid the signals an attack is about to begin. Before the physical attack comes the psychic aggression.