Invisibility in combat

The main two methods of invisibility in self defence work are:

1. Cold jing
2. Being unseen by the opponent

Cold jing is the act of striking without any discernable build-up. It must be a spontaneous, whole-body action.

There are many ways to remain unseen. By evading the line of force - without blocking - you gain an interval of time in which to act.
Concealment, misdirection, feinting and luring can be used to keep the attacker doubtful and hesitant.
If you only employ 4 ounces of pressure at all times, then the attacker cannot feel your actions in advance.
Stepping, evasion, listening and sensitivity all provide opportunities to disguise your direction and intentions.
Unorthodoxy, unpredictability, improvisation, adaptation and change make your actions difficult to anticipate and respond to.