diff --git a/context/subsystems.md b/context/subsystems.md
index 516b5a5..5076441 100644
--- a/context/subsystems.md
+++ b/context/subsystems.md
@@ -87,8 +87,14 @@ Making a base byte-exact GROWS every subclass — they must be re-based TOGETHER
      `Mech+0x7A0` (cap) = port `reverseSpeedMax2` — both documented misnomers.
   4. **The ENG-page power curve** — SeekVoltageResponse, now at the correct absolute scale
      (OwnerBaseSpeed reads the real base instead of the 1.0 stub).
-  5. **Electrical sourcing** — low seek gears keep the myomers runnable on a browned-out
-     generator (HasVoltage: `gear voltage <= measured`).
+  5. **Electrical sourcing — the dial's REAL stake is TORSO TWIST.**  A gear's voltage must be
+     <= the generator's measured output (`(1 − generator damage) × rated`, thermal breaker on
+     FailureHeat; there is NO load model — demand never pulls the bus down), or the myomers leave
+     Ready.  The Torso is a PowerWatcher on the myomers: `TorsoSimulation` ZEROES the twist rate
+     while the watched myomers are not Ready (halves it at DegradationHeat) — so an over-high gear
+     on a damaged generator freezes the pilot's AIM until they downshift.  On a healthy mech,
+     gears 1-3 are literally identical (heat ratio floors at 1, no speed coupling); gear 4 =
+     double heat + a tighter dropout threshold for nothing but the taller graph — a trap.
   **Deliberately REMOVED (was an invention): the `speedDemand *= speedEffect` demand multiplier**
   (mechmppr.cpp) and `BTMyomersDriveOf`.  Damaged-but-alive myomers heat faster and drop the
   power curve but do NOT slow the mech — gitea #75's premise is falsified by the binary; the