I was seriously hoping that a system similar to Field Spells from Yu-Gi-Oh! in which that only one location can be on the board at one time I mean think about this logically.Both Players are at two different locations, I just thought that shadow era would of at least put that if a location is summoned while a location is on the board, that the first location is destroyed and the players enter a new location.. (Maybe I'm reading something wrong but that's my opinion.)