An interesting practical tutorial on states of alertness.

If you should find yourself faced with a life-threatening attack by a criminal, as a typical normal person, you will be faced by three enormous difficulties. They are:

1. Recognizing the presence of the predator in time;

2. Realizing, internalizing, and accepting that THAT MAN, RIGHT THERE, is about to kill you for reasons you do not understand; if you don't stop him; and

3. Overcoming your reluctance to do lethal violence against a fellow human being.

Read the rest here.