It still comes down to whether or not a magistrate or jury actually believe you. As (I think it was McSenesei said) testifying things like 'shoulders dipped, they became monosyllabic, their eyes narrowed, their breathing rate altered and their skin tone changed, would be like telling them (the jury or magistrate) that you had read it in your horoscope.
Anyway, I still hold the same views as I always have, so nothing has changed as far as I am concerned.
The patterns described don't just happen by accident and I would say that individually, they are not good indicators but in combination, they form a good indicator as to when an attack may happen. Body language is a very important facet of everyday life, as anyone versed in psychology, NLP or conflict resolution will tell you. This is far from being "horoscope-like", it is a science which has a basis in our evolutionary and social history. Even if you don't strike pre-emptively, acknowledging this may help to save your life in the long run.
Specialists can be brought into court to testify on this issue. It objectifies the claim of self defense, rather than leaving it subjective.
Naturally, I did not expect you to change your principles. However, you must admit that if a pre-emptive strike did occur, this information forms the best argument that it occurred in self defense and may turn a jury or magistrate to the side of accepting the self defense claim. Outside of the circumstances described, a strike is not pre-emptive but must be considered to be assault.
_________________________ Self Defense (Website by Marc MacYoung, not me)