Reverse Mountain Calm-Belt Red-Line Geography Setup
Status: confirmed · Technique: chekhov-explicit, world-building-articulation
The seed
The payoff
Why this matters
The doctrine is delivered in-passing by a local expert (Crocus) as common-knowledge — exactly the world-building-articulation technique Oda uses for load-bearing geography. Future readers should weight any in-passing geography-articulation by a local elder as load-bearing for later plot-system structure — not background flavor.