Rule 5: Stay calm

5a. Don’t spook a scared animal.

5b. The same principle applies to humans on the edge. No loud noises, no sudden movements and no big gestures. If you think someone is dangerous or crazy then they probably are, so there is no need to provoke them.

Rule 1: Be invisible
Rule 2: Expect the unexpected
Rule 3: Details matter
Rule 4: Body language
Rule 5: Stay calm
Rule 6: Undercover work
Rule 7: It's still a job
Glossary
About Bob Bernstein