By LUPER 
The idea behind this statement is that anger is often seen as an emotional response that can be easily anticipated and understood. When people display anger, it is a typical reaction, and others may prepare themselves for it, even in a confrontational situation. However, when you withhold anger and instead remain calm, detached, or even indifferent, it can be much more unsettling and terrifying.
This is because people are less able to predict how to react or what to expect. Calmness in the face of conflict or danger can create an atmosphere of unpredictability, which is often more intimidating than an outburst of anger. It signals that the person in control is not emotionally invested or easily rattled, making them more dangerous in the eyes of others.
The sense of being unbothered by the situation can provoke anxiety and fear because people don’t know what could happen next, or what might be lurking beneath the surface.
