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diff --git a/game/server/hl2/ai_behavior_actbusy.h b/game/server/hl2/ai_behavior_actbusy.h
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+++ b/game/server/hl2/ai_behavior_actbusy.h
@@ -0,0 +1,318 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================//
+
+#ifndef AI_BEHAVIOR_ACTBUSY_H
+#define AI_BEHAVIOR_ACTBUSY_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "ai_behavior.h"
+#include "ai_goalentity.h"
+
+//-----------------------------------------------------------------------------
+enum
+{
+	ACTBUSY_TYPE_DEFAULT = 0,
+	ACTBUSY_TYPE_COMBAT,
+};
+
+enum busyinterrupt_t
+{
+	BA_INT_NONE,		// Nothing breaks us out of this
+	BA_INT_DANGER,		// Only danger signals interrupts this busy anim. The player will be ignored.
+	BA_INT_PLAYER,		// The Player's presence interrupts this busy anim
+	BA_INT_AMBUSH,		// We're waiting to ambush enemies. Don't break on danger sounds in front of us.
+	BA_INT_COMBAT,		// Only break out if we're shot at.
+	BA_INT_ZOMBIESLUMP,	// Zombies who are slumped on the ground.
+	BA_INT_SIEGE_DEFENSE,
+};
+
+enum busyanimparts_t
+{
+	BA_BUSY,
+	BA_ENTRY,
+	BA_EXIT,
+
+	BA_MAX_ANIMS,
+};
+
+struct busyanim_t
+{
+	string_t			iszName;
+	Activity			iActivities[BA_MAX_ANIMS];
+	string_t			iszSequences[BA_MAX_ANIMS];
+	string_t			iszSounds[BA_MAX_ANIMS];
+	float				flMinTime;		// Min time spent in this busy animation
+	float				flMaxTime;		// Max time spent in this busy animation. 0 means continue until interrupted.
+	busyinterrupt_t		iBusyInterruptType;
+	bool				bUseAutomovement;
+};
+
+struct busysafezone_t
+{
+	Vector	vecMins;
+	Vector	vecMaxs;
+};
+
+#define NO_MAX_TIME -1
+
+class CAI_ActBusyGoal;
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+class CAI_ActBusyBehavior : public CAI_SimpleBehavior
+{
+	DECLARE_CLASS( CAI_ActBusyBehavior, CAI_SimpleBehavior );
+public:
+	DECLARE_DATADESC();
+	CAI_ActBusyBehavior();
+
+	enum
+	{
+		// Schedules
+		SCHED_ACTBUSY_START_BUSYING = BaseClass::NEXT_SCHEDULE,
+		SCHED_ACTBUSY_BUSY,
+		SCHED_ACTBUSY_STOP_BUSYING,
+		SCHED_ACTBUSY_LEAVE,
+		SCHED_ACTBUSY_TELEPORT_TO_BUSY,
+		NEXT_SCHEDULE,
+		
+		// Tasks
+		TASK_ACTBUSY_PLAY_BUSY_ANIM = BaseClass::NEXT_TASK,
+		TASK_ACTBUSY_PLAY_ENTRY,
+		TASK_ACTBUSY_PLAY_EXIT,
+		TASK_ACTBUSY_TELEPORT_TO_BUSY,
+		TASK_ACTBUSY_WALK_PATH_TO_BUSY,
+		TASK_ACTBUSY_GET_PATH_TO_ACTBUSY,
+		TASK_ACTBUSY_VERIFY_EXIT,
+		NEXT_TASK,
+		
+		// Conditions
+		COND_ACTBUSY_LOST_SEE_ENTITY = BaseClass::NEXT_CONDITION,
+		COND_ACTBUSY_AWARE_OF_ENEMY_IN_SAFE_ZONE,
+		COND_ACTBUSY_ENEMY_TOO_CLOSE,
+		NEXT_CONDITION,
+	};
+	
+	virtual const char *GetName() {	return "ActBusy"; }
+
+	void	Enable( CAI_ActBusyGoal *pGoal, float flRange, bool bVisibleOnly );
+	void	OnRestore();
+	void	SetBusySearchRange( float flRange );
+	void	Disable( void );
+	void	ForceActBusy( CAI_ActBusyGoal *pGoal, CAI_Hint *pHintNode = NULL, float flMaxTime = NO_MAX_TIME, bool bVisibleOnly = false, bool bTeleportToBusy = false, bool bUseNearestBusy = false, CBaseEntity *pSeeEntity = NULL, Activity activity = ACT_INVALID );
+	void	ForceActBusyLeave( bool bVisibleOnly = false );
+	void	StopBusying( void );
+	bool	IsStopBusying();
+	CAI_Hint *FindActBusyHintNode( void );
+	CAI_Hint *FindCombatActBusyHintNode( void );
+	CAI_Hint *FindCombatActBusyTeleportHintNode( void );
+	bool	CanSelectSchedule( void );
+	bool	IsCurScheduleOverridable( void );
+	bool	ShouldIgnoreSound( CSound *pSound );
+	void	OnFriendDamaged( CBaseCombatCharacter *pSquadmate, CBaseEntity *pAttacker );
+	int		OnTakeDamage_Alive( const CTakeDamageInfo &info );
+	void	GatherConditions( void );
+	void	BuildScheduleTestBits( void );
+	void	EndScheduleSelection( void );
+	Activity NPC_TranslateActivity( Activity nActivity );
+	void	HandleAnimEvent( animevent_t *pEvent );
+	void	CheckAndCleanupOnExit( void );
+	bool	FValidateHintType( CAI_Hint *pHint );
+	bool	ActBusyNodeStillActive( void );
+	bool	IsMovingToBusy( void ) { return m_bMovingToBusy; }
+	bool	IsEnabled( void ) { return m_bEnabled; }
+	float	GetReasonableFacingDist( void ) { return 0; }	// Actbusy ignores reasonable facing
+	bool	IsInterruptable( void );
+	bool	ShouldPlayerAvoid( void );
+	void	SetUseRenderBounds( bool bUseBounds ) { m_bUseRenderBoundsForCollision = bUseBounds; }
+	void	ComputeAndSetRenderBounds();
+	bool	CanFlinch( void );
+	bool	CanRunAScriptedNPCInteraction( bool bForced );
+	void	OnScheduleChange();
+	bool	QueryHearSound( CSound *pSound );
+	void	OnSeeEntity( CBaseEntity *pEntity );
+	bool	NeedsToPlayExitAnim() { return m_bNeedsToPlayExitAnim; }
+
+	// Returns true if the current NPC is acting busy, or moving to an actbusy
+	bool	IsActive( void );
+	// Returns true if the current NPC is actually acting busy (i.e. inside an act busy anim)
+	bool	IsInsideActBusy( void ) { return m_bBusy; }
+
+	// Combat act busy stuff
+	bool	IsCombatActBusy();
+	void 	CollectSafeZoneVolumes( CAI_ActBusyGoal *pActBusyGoal );
+	bool	IsInSafeZone( CBaseEntity *pEntity );
+	int		CountEnemiesInSafeZone();
+
+private:
+	virtual int		SelectSchedule( void );
+	int				SelectScheduleForLeaving( void );
+	int				SelectScheduleWhileNotBusy( int iBase );
+	int				SelectScheduleWhileBusy( void );
+	virtual void	StartTask( const Task_t *pTask );
+	virtual void	RunTask( const Task_t *pTask );
+	void			NotifyBusyEnding( void );
+	bool			HasAnimForActBusy( int iActBusy, busyanimparts_t AnimPart );
+	bool			PlayAnimForActBusy( busyanimparts_t AnimPart );
+	void			PlaySoundForActBusy( busyanimparts_t AnimPart ); 
+
+private:
+	bool			m_bEnabled;
+	bool			m_bForceActBusy;
+	Activity		m_ForcedActivity;
+	bool			m_bTeleportToBusy;
+	bool			m_bUseNearestBusy;
+	bool			m_bLeaving;
+	bool			m_bVisibleOnly;
+	bool			m_bUseRenderBoundsForCollision;
+	float			m_flForcedMaxTime;
+	bool			m_bBusy;
+	bool			m_bMovingToBusy;
+	bool			m_bNeedsToPlayExitAnim;
+	float			m_flNextBusySearchTime;	
+	float			m_flEndBusyAt;
+	float			m_flBusySearchRange;
+	bool			m_bInQueue;
+	int				m_iCurrentBusyAnim;
+	CHandle<CAI_ActBusyGoal> m_hActBusyGoal;
+	bool			m_bNeedToSetBounds;
+	EHANDLE			m_hSeeEntity;
+	float			m_fTimeLastSawSeeEntity;
+	bool			m_bExitedBusyToDueLostSeeEntity;
+	bool			m_bExitedBusyToDueSeeEnemy;
+
+	int				m_iNumConsecutivePathFailures; // Count how many times we failed to find a path to a node, so we can consider teleporting.
+	bool			m_bAutoFireWeapon;
+	float			m_flDeferUntil;
+	int				m_iNumEnemiesInSafeZone;
+
+	CUtlVector<busysafezone_t>m_SafeZones;
+
+	DEFINE_CUSTOM_SCHEDULE_PROVIDER;
+};
+
+
+//-----------------------------------------------------------------------------
+// Purpose: A level tool to control the actbusy behavior.
+//-----------------------------------------------------------------------------
+class CAI_ActBusyGoal : public CAI_GoalEntity
+{
+	DECLARE_CLASS( CAI_ActBusyGoal, CAI_GoalEntity );
+public:
+	CAI_ActBusyGoal()
+	{
+		// Support legacy maps, where this value used to be set from a constant (with a value of 1).
+		// Now designers can specify whatever they want in Hammer. Take care of old maps by setting
+		// this in the constructor. (sjb)
+		m_flSeeEntityTimeout = 1;
+	}
+
+	virtual void NPCMovingToBusy( CAI_BaseNPC *pNPC );
+	virtual void NPCAbortedMoveTo( CAI_BaseNPC *pNPC );
+	virtual void NPCStartedBusy( CAI_BaseNPC *pNPC );
+	virtual void NPCStartedLeavingBusy( CAI_BaseNPC *pNPC );
+	virtual void NPCFinishedBusy( CAI_BaseNPC *pNPC );
+	virtual void NPCLeft( CAI_BaseNPC *pNPC );
+	virtual void NPCLostSeeEntity( CAI_BaseNPC *pNPC );
+	virtual void NPCSeeEnemy( CAI_BaseNPC *pNPC );
+
+	int GetType() { return m_iType; }
+	bool IsCombatActBusyTeleportAllowed()	{ return m_bAllowCombatActBusyTeleport; }
+
+protected:
+	CAI_ActBusyBehavior *GetBusyBehaviorForNPC( const char *pszActorName, CBaseEntity *pActivator, CBaseEntity *pCaller, const char *sInputName );
+	CAI_ActBusyBehavior *GetBusyBehaviorForNPC( CBaseEntity *pEntity, const char *sInputName );
+
+	void		 EnableGoal( CAI_BaseNPC *pAI );
+
+	// Inputs
+	virtual void InputActivate( inputdata_t &inputdata );
+	virtual void InputDeactivate( inputdata_t &inputdata );
+	void		 InputSetBusySearchRange( inputdata_t &inputdata );
+	void		 InputForceNPCToActBusy( inputdata_t &inputdata );
+	void		 InputForceThisNPCToActBusy( inputdata_t &inputdata );
+	void		 InputForceThisNPCToLeave( inputdata_t &inputdata );
+
+	DECLARE_DATADESC();
+
+protected:
+	float			m_flBusySearchRange;
+	bool			m_bVisibleOnly;
+	int				m_iType;
+	bool			m_bAllowCombatActBusyTeleport;
+
+public:
+	// Let the actbusy behavior query these so we don't have to duplicate the data.
+	string_t		m_iszSeeEntityName;
+	float			m_flSeeEntityTimeout;
+	string_t		m_iszSafeZoneVolume;
+	int				m_iSightMethod;
+
+protected:
+	COutputEHANDLE	m_OnNPCStartedBusy;
+	COutputEHANDLE	m_OnNPCFinishedBusy;
+	COutputEHANDLE	m_OnNPCLeft;
+	COutputEHANDLE	m_OnNPCLostSeeEntity;
+	COutputEHANDLE	m_OnNPCSeeEnemy;
+};
+
+// Maximum number of nodes allowed in an actbusy queue
+#define MAX_QUEUE_NODES		20
+
+//-----------------------------------------------------------------------------
+// Purpose: A level tool to control the actbusy behavior to create NPC queues 
+//-----------------------------------------------------------------------------
+class CAI_ActBusyQueueGoal : public CAI_ActBusyGoal
+{
+	DECLARE_CLASS( CAI_ActBusyQueueGoal, CAI_ActBusyGoal );
+public:
+	virtual void Spawn( void );
+	virtual void DrawDebugGeometryOverlays( void );
+	virtual void NPCMovingToBusy( CAI_BaseNPC *pNPC );
+	virtual void NPCStartedBusy( CAI_BaseNPC *pNPC );
+	virtual void NPCAbortedMoveTo( CAI_BaseNPC *pNPC );
+	virtual void NPCFinishedBusy( CAI_BaseNPC *pNPC );
+	virtual void NPCStartedLeavingBusy( CAI_BaseNPC *pNPC );
+
+	virtual void InputActivate( inputdata_t &inputdata );
+	void		 InputPlayerStartedBlocking( inputdata_t &inputdata );
+	void		 InputPlayerStoppedBlocking( inputdata_t &inputdata );
+	void		 InputMoveQueueUp( inputdata_t &inputdata );
+
+	void		 PushNPCBackInQueue( CAI_BaseNPC *pNPC, int iStartingNode );
+	void		 RemoveNPCFromQueue( CAI_BaseNPC *pNPC );
+	void		 RecalculateQueueCount( void );
+	void		 QueueThink( void );
+  	void		 MoveQueueUp( void );
+  	void		 MoveQueueUpThink( void );
+	bool		 NodeIsOccupied( int i );
+	CAI_BaseNPC			*GetNPCOnNode( int iNode );
+	CAI_ActBusyBehavior *GetQueueBehaviorForNPC( CAI_BaseNPC	*pNPC );
+
+	DECLARE_DATADESC();
+
+private:
+	int						m_iCurrentQueueCount;
+	CHandle<CAI_Hint>		m_hNodes[ MAX_QUEUE_NODES ];
+	bool					m_bPlayerBlockedNodes[ MAX_QUEUE_NODES ];
+	EHANDLE					m_hExitNode;
+	EHANDLE					m_hExitingNPC;
+	bool					m_bForceReachFront;
+
+	// Read from mapdata
+	string_t		m_iszNodes[ MAX_QUEUE_NODES ];
+	string_t		m_iszExitNode;
+
+	// Outputs
+	COutputInt		m_OnQueueMoved;
+	COutputEHANDLE	m_OnNPCLeftQueue;
+	COutputEHANDLE	m_OnNPCStartedLeavingQueue;
+};
+
+#endif // AI_BEHAVIOR_ACTBUSY_H