Binary citation behavior: above threshold = confident citation, below = hedging/omission. Not gradual dial. Small confidence drop can cause large behavioral change if threshold crossed. Explains contested posture invisibility: entropy accumulates gradually, citation failure is sudden. Monitor schema entropy rate to detect approaching threshold before behavioral collapse. Similar to structural engineering: stress accumulates gradually, failure is discontinuous. Use quarterly testing to detect threshold proximity. Response to threshold approach: immediate corroboration campaign, schema coherence restoration, verification gate re-testing.