Wicc
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Show an example from the rules that is not an exception to them, which confirms your words that it is possible to move onto the sand before breaking through the GO (Guard Outpost).
There is an analysis of such a situation in the comments on the rules.
It says there: The passage from the Tower's starting zone to the center is guarded by two GOs – Golden Dragons and Sultan Efreet. The Blue player has the right to break through any guard he chooses. He can go out onto the sand and pass by the moved dragons to break through the efreets.