Fixed bug causing NPCs to never be attacked in combat.

Platform/Apple/virtual/src/plasma/combat.pla

@@ -21,6 +21,7 @@ predef _combat_zoneEncounter(s_encZone)#1
 word[] funcTbl = @_combat_zoneEncounter
 
 // Combat variables that don't need to be saved in game state
+byte nPartyFighting
 byte nPlayersFighting
 byte nEnemiesFighting
 byte isFleeing
@@ -724,7 +725,7 @@ def enemyCombatTurn(pe)#1
   byte roll, dam, needShow
 
   // Choose a random target from amongst the fighting players
-  roll = rand16() % nPlayersFighting
+  roll = rand16() % nPartyFighting
   pl = select(global=>p_players, @canFight, roll)
   isPlural = FALSE
   displayf3("\n%s %s %s ", pe=>s_name, pe=>s_attackText, pl=>s_name)
@@ -772,7 +773,10 @@ def enemyCombatTurn(pe)#1
       pl=>w_health = max(0, pl=>w_health - dam)
       if pl=>w_health == 0
         displayf1(" %s is killed!", pl=>s_name)
-        nPlayersFighting--
+        nPartyFighting--
+        if (!(pl->b_playerFlags & PLAYER_FLAG_NPC))
+          nPlayersFighting--
+        fin
       fin
       needShow = TRUE
     fin
@@ -808,6 +812,7 @@ end
 def determineCombatOrder()#0
   word p, p2
 
+  nPartyFighting   = 0
   nPlayersFighting = 0
   nEnemiesFighting = 0
 
@@ -818,8 +823,9 @@ def determineCombatOrder()#0
     if canFight(p)
       p->b_combatOrder = rand16() % (p->b_agility * 10)
       combatInsert(p)
+      nPartyFighting++
       if (!(p->b_playerFlags & PLAYER_FLAG_NPC)) // only count real players
-        nPlayersFighting = nPlayersFighting + 1
+        nPlayersFighting++
       fin
     fin
     p = p=>p_nextObj