#89 DEATH BLAST reconstructed: a dying mech splashes its neighborhood

The missing half of Advanced Damage, found by call-scanning
Explosion::SplashDamage @0042fad0: TWO callers, not one -- Missile::Perform
(the known #62 path) and 0x4a0bda, the UN-EXPORTED tail of
Mech::TakeDamageMessageHandler itself.  Raw disasm @0x4a07b8-0x4a0bda:
when the victim ENTERS dead(9)/eject(10) during the applications, the
binary sets the wreck burning (id 0x17, deferred -- handler not yet
reconstructed), spawns the death Explosion (model 0x31 -- our death-list
visuals stand in), and SPLASHES:
  gates : owning player's advancedDamageOn (+0x264) AND NOT
          suppressConsole (+0x258 -- eject sets it: PUNCH-OUTS NEVER
          BLAST, the authentic anti-suicide-bomb rule)
  damage: type 2 Explosive, amount = deathSplashDamage (mech+0x520),
          bursts = round(0.001 * moverMass * 15.0) -- scales with tonnage
  radius: deathSplashRadius (mech+0x524); per-victim falloff
          bursts/dist^1.25 in the shared core
Draco's collision-divert suspicion is settled: the blast is TYPE 2, the
divert never touched it -- the tail was simply never reconstructed.

Port: deathSplashDamage/Radius PROMOTED from the Wword scratch bank to
named Mech members (the bank is one GLOBAL array -- authored per-chassis
values were clobbered to the last-loaded mech); BTSplashCore split out of
the #62 weapon splash and shared; BTApplyDeathSplash + the death-edge arm
in the handler tail; BTPlayerConsoleSuppressed bridge (friend).

Bench (2-node, B parked 8.9u from a self-destructing A): blast fired with
authored madcat data (radius=50, amount=5, mass=75000 -> 1125 base
bursts), B took 73 bursts (falloff exact: 1125/8.91^1.25), cross-pod
delivery + cylinder spray verified on B's own log ([dmghit] type=2
burst=73 across zones).  ~365 damage at 9u -- Draco's 'double kills on
drops' economy restored.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

game/reconstructed/mech.cpp

@@ -1126,6 +1126,11 @@ void
 	// nothing (matches ENTITY.cpp:878; the binary would deref -1 -- it can't
 	// happen there because every mech ships a lookup table).
 	//
+	// #89 DEATH-BLAST edge arm: the binary's tail (@0x4a07b8) gates on the
+	// victim ENTERING dead/eject during THIS message (entry test edx = the
+	// pre-application disabled state).  Capture the pre-state here.
+	const int deathBlastArmed = !IsMechDestroyed();
+
 	if (damageZones != 0 && message->damageZone >= 0
 		&& message->damageZone < damageZoneCount)
 	{
@@ -1212,6 +1217,34 @@ void
 			(float)message->damageData.impactPoint.y,
 			(float)message->damageData.impactPoint.z);
 	}
+
+	// #89 DEATH BLAST (raw disasm @0x4a07b8-0x4a0bda -- the un-exported tail
+	// of THIS handler; found by call-scanning Explosion::SplashDamage
+	// @0042fad0, which has exactly TWO callers: Missile::Perform and here).
+	// The binary, when the victim ENTERS dead(9)/eject(10) during the
+	// applications above:
+	//   1. self-dispatches SetBurningState (id 0x17, Damage payload, zone -1)
+	//      -- the burning wreck.  DEFERRED here: our 0x17 handler is not yet
+	//      reconstructed; the port's wreck-fire visuals come from the death
+	//      effect layer meanwhile.
+	//   2. spawns the death Explosion (Explosion::Make model 0x31 at the mech
+	//      origin) -- the port's kill path already fires the authored death
+	//      list visuals; not double-spawned.
+	//   3. calls SplashDamage on it, gated on the owning player's
+	//      advancedDamageOn (+0x264) AND NOT suppressConsole (+0x258 -- set
+	//      by the eject bookkeeping: an EJECTED pilot's mech never blasts):
+	//        Damage{type=2 Explosive, amount=deathSplashDamage@0x520,
+	//               impact=mech origin,
+	//               burstCount=round(0.001 * moverMass@0x20c * 15.0)}
+	//        radius=deathSplashRadius@0x524, excluded=the dying mech.
+	//      Splash falloff (bursts / dist^1.25) applies inside per victim.
+	//   4. ForceUpdate(1).  (A score/console post also rides this tail --
+	//      the deferred id-0x16 family, tracked with #134.)
+	if (deathBlastArmed && IsMechDestroyed())
+	{
+		extern void BTApplyDeathSplash(void *mech_v);
+		BTApplyDeathSplash((void *)this);
+	}
 }
 
 //
@@ -1898,8 +1931,11 @@ Mech::Mech(
 
 	Wword(0x68) = model->cameraOffset;					// FUN_00408440(this+0x1a0, rec+0xA8)
 	Wword(0x130) = model->deathEffectResourceID;		// rec+0x74 -> mech+0x4c0
-	Wword(0x148) = model->deathSplashDamage;			// rec+0x78 -> mech+0x520
-	Wword(0x149) = model->deathSplashRadius;			// rec+0x7C -> mech+0x524
+	deathSplashDamage = model->deathSplashDamage;		// rec+0x78 -> mech+0x520 (#89:
+	deathSplashRadius = model->deathSplashRadius;		// rec+0x7C -> mech+0x524  named
+														// members -- the Wword bank is
+														// GLOBAL and clobbered per-mech
+														// values chassis-to-chassis)
 	Wword(0x195) = Wword(0x196) = 0;
 	Wword(0xfd)  = 0;
 	masterAlarm.SetLevel(0);							// FUN_0041bbd8(this+0xe7,0)