guards use city player memory to determine whether they go idle or not

src/engine/mobileAI/MobAI.java

@@ -578,14 +578,24 @@ public class MobAI {
                 return;
             }
 
-            //no players loaded, no need to proceed
+            //no players loaded, no need to proceed unless it's a player guard
+            boolean bypassLoadedPlayerCheck = false;
+            if(mob.isPlayerGuard()) {
+
+                if (mob.guardedCity != null) {
+                    if (!mob.guardedCity._playerMemory.isEmpty()) {
+                        bypassLoadedPlayerCheck = true;
+                    }
+                }
+            }
 
-            if (mob.playerAgroMap.isEmpty()) {
+            if (mob.playerAgroMap.isEmpty() && !bypassLoadedPlayerCheck) {
                 if (mob.getCombatTarget() != null)
                     mob.setCombatTarget(null);
                 return;
             }
 
+
             if (mob.agentType.equals(Enum.AIAgentType.PET) == false)
                 CheckToSendMobHome(mob);