I'm talking about the formational fighting show in this video: http://www.youtube.com/watch?v=pJO2UfG9KcI
Where did the show's creators get the source material? If so, what was it called, when did this style of fighting start and was it effective?
The Romans would have a tactic of three lines, where first the the second and then the third line would press themselves between the first line when needed to let the first line get a breather and reform.
The formation was called "Acies triplex", which just means "triple line". I can't find any reference to a name of the "rank switching".