diff --git a/src/server/game/AI/CreatureAI.cpp b/src/server/game/AI/CreatureAI.cpp
index efcd72353a..6f5470c7a1 100644
--- a/src/server/game/AI/CreatureAI.cpp
+++ b/src/server/game/AI/CreatureAI.cpp
@@ -353,23 +353,18 @@ int32 CreatureAI::VisualizeBoundary(uint32 duration, Unit* owner, bool fill) con
 
 bool CreatureAI::CheckBoundary(Position const* who) const
 {
+    if (!_boundary)
+        return true;
+
     if (!who)
         who = me;
 
-    if (_boundary)
-        for (AreaBoundary const* areaBoundary : *_boundary)
-            if (!areaBoundary->IsWithinBoundary(who))
-                return false;
-
-    return true;
+    return (CreatureAI::IsInBounds(*_boundary, who) != _negateBoundary);
 }
 
-bool CreatureAI::IsInBounds(CreatureBoundary const* boundary, Position const* pos)
+bool CreatureAI::IsInBounds(CreatureBoundary const& boundary, Position const* pos)
 {
-    if (!boundary)
-        return true;
-
-    for (AreaBoundary const* areaBoundary : *boundary)
+    for (AreaBoundary const* areaBoundary : boundary)
         if (!areaBoundary->IsWithinBoundary(pos))
             return false;
 
@@ -387,6 +382,13 @@ bool CreatureAI::CheckInRoom()
     }
 }
 
+void CreatureAI::SetBoundary(CreatureBoundary const* boundary, bool negateBoundaries /*= false*/)
+{
+    _boundary = boundary;
+    _negateBoundary = negateBoundaries;
+    me->DoImmediateBoundaryCheck();
+}
+
 Creature* CreatureAI::DoSummon(uint32 entry, const Position& pos, uint32 despawnTime, TempSummonType summonType)
 {
     return me->SummonCreature(entry, pos, summonType, despawnTime);
diff --git a/src/server/game/AI/CreatureAI.h b/src/server/game/AI/CreatureAI.h
index d07ef4896a..c0c832ad69 100644
--- a/src/server/game/AI/CreatureAI.h
+++ b/src/server/game/AI/CreatureAI.h
@@ -82,7 +82,6 @@ class TC_GAME_API CreatureAI : public UnitAI
 
         bool CheckBoundary(Position const* who = nullptr) const;
 
-        void SetBoundary(CreatureBoundary const* boundary) { _boundary = boundary; me->DoImmediateBoundaryCheck(); }
     public:
         enum EvadeReason
         {
@@ -95,7 +94,7 @@ class TC_GAME_API CreatureAI : public UnitAI
 
         void Talk(uint8 id, WorldObject const* whisperTarget = nullptr);
 
-        explicit CreatureAI(Creature* creature) : UnitAI(creature), me(creature), _boundary(nullptr), m_MoveInLineOfSight_locked(false) { }
+        explicit CreatureAI(Creature* creature) : UnitAI(creature), me(creature), _boundary(nullptr), _negateBoundary(false), m_MoveInLineOfSight_locked(false) { }
 
         virtual ~CreatureAI() { }
 
@@ -200,11 +199,12 @@ class TC_GAME_API CreatureAI : public UnitAI
         virtual PlayerAI* GetAIForCharmedPlayer(Player* /*who*/) { return nullptr; }
 
         // intended for encounter design/debugging. do not use for other purposes. expensive.
-        int32 VisualizeBoundary(uint32 duration, Unit* owner=nullptr, bool fill=false) const;
+        int32 VisualizeBoundary(uint32 duration, Unit* owner = nullptr, bool fill = false) const;
         virtual bool CheckInRoom();
         CreatureBoundary const* GetBoundary() const { return _boundary; }
+        void SetBoundary(CreatureBoundary const* boundary, bool negativeBoundaries = false);
 
-        static bool IsInBounds(CreatureBoundary const* boundary, Position const* who);
+        static bool IsInBounds(CreatureBoundary const& boundary, Position const* who);
 
     protected:
         virtual void MoveInLineOfSight(Unit* /*who*/);
@@ -212,6 +212,7 @@ class TC_GAME_API CreatureAI : public UnitAI
         bool _EnterEvadeMode(EvadeReason why = EVADE_REASON_OTHER);
 
         CreatureBoundary const* _boundary;
+        bool _negateBoundary;
 
     private:
         bool m_MoveInLineOfSight_locked;
diff --git a/src/server/scripts/Northrend/AzjolNerub/AzjolNerub/boss_anubarak.cpp b/src/server/scripts/Northrend/AzjolNerub/AzjolNerub/boss_anubarak.cpp
index 0a2321eeff..c223d6b723 100644
--- a/src/server/scripts/Northrend/AzjolNerub/AzjolNerub/boss_anubarak.cpp
+++ b/src/server/scripts/Northrend/AzjolNerub/AzjolNerub/boss_anubarak.cpp
@@ -492,7 +492,7 @@ class npc_anubarak_anub_ar_assassin : public CreatureScript
                     Position jumpTo;
                     do
                         jumpTo = GetRandomPositionAround(anubarak);
-                    while (!CreatureAI::IsInBounds(boundary, &jumpTo));
+                    while (!CreatureAI::IsInBounds(*boundary, &jumpTo));
                     me->GetMotionMaster()->MoveJump(jumpTo, 40.0f, 40.0f);
                     DoCastSelf(SPELL_ASSASSIN_VISUAL, true);
                 }