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Since I usually braid the extension hair all the way to the end, I guess someone using your method who wanted to do the same could just split the two sections of extension hair into 3 parts once s/he got beyond the real hair. Great demo indeed! 
http://www.longhaircareforum.com/showthread.php?t=14031&highlight=section
Like this one: http://universalclass.com/i/crn/9317.htm