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Out of the two points in the rules that are highlighted in bold, one is this: "If there is no guard at the passage, including if it has been moved, it is permissible to freely move from one spawn point to another."
The fact that there is no one to fight if there is no guard seems obvious. Therefore, the only purpose of writing (and highlighting!) this particular provision was to try to indicate that single possible case in which one can move to another territory without a fight. I hope my logic doesn't seem perverse to everyone :) But, as it turns out, I didn't understand it as it should have been.
Apparently, the question can be considered closed. I admit my defeat and confirm the report (especially since the opponent is worthy, and I didn't have many chances in the game anyway :))
P.S. Guys, please make the rules understandable to beginners and, if possible, avoid double interpretations and eliminate the occurrence of similar situations.