Manners

A lot of the rules are just good manners. #19, Do not bump other people on the dance floor, must be important because almost the same one appears as #14, No acrobatics on a social/crowded dance floor.
#9 is specific and seems to show that Benson Wong did a lot of swing. "During beats 4&4 of a lindy turn, the woman will walk *towards* her partner."