Based on the information given, the character of John represents crossing the threshold into the unknown.
It should be noted that tribal law forbids crossing certain boundaries to enter zones declared off-limits.
The unknown on the side of the boundaries may be truly dangerous in a threatening sense, but they also may be dangerous in the sense of creating instability among a functioning society.
In this case, the thematic underpinning is that very often the only way to move forward is by risking entry into the abyss of the unknown.
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