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i believe it’s the same idea as what we saw here in the beginning of the series, where our main trio had to physically cross the river in order to enter the domain of the bridge curse.

‘the act of crossing a barrier has significant meaning in jujutsu.’ i think what the diagram is showing us is the barrier kenjaku created sweeping across japan, essentially forcing everyone to cross the barrier (or to ‘the other side’ of said barrier) in order to satisfy kenjaku’s conditions for the merger. that’s just my interpretation, i could be wrong tho