This really gives me an idea what a real-life Mugen might look like:
(above art from nerdking on deviantart:
http://nerdkng.deviantart.com/art/mugen-samurai-champloo-99073868)
And fuckitall if this isn't what he might act like:
Click to view
16th Street Bart Station Incident Add: this is the sort of thing where an Aikidoka would make quick work of the hazard. Approach, try to talk the guy down, if he attacks, pin him, problem solved--he's restrained until police arrive to deal with his issues. Nobody gets scared or hurt.