If the divided path is flipped the nodes are numbered in the reverse order. It also switches the ends from which beginningIndent and endIndent are measured from. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2013