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At the end when you are on the train and the citadel blows up, look to the left and you can see a distant beam going up into the sky. The beam is to far away to see its origin but im speculating its another citadel sending a message to the combine union as the citadel in City 17 is doing when it blows up. Could i be right or is there something ells behind the beam? I cant see any other beams but that one.