I also agree with the earlier posts (and great stories, too!). Most styles of aikido teach the thought of "appropriate usage of ki" (ki no myoyo tadshiku?) in some form or another (I know Seidokan among possible others makes this an actual "principle" to follow).
So Drew, probably not the easiest answers you were hoping for, but it really is tough to "mandate" when it is appropriate.
When in doubt, resort to the legal implications and morals, not to Hollywood.
