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diff --git a/game/server/hl2/npc_headcrab.h b/game/server/hl2/npc_headcrab.h
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+++ b/game/server/hl2/npc_headcrab.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: Defines the headcrab, a tiny, jumpy alien parasite.
+//
+//=============================================================================//
+
+#ifndef NPC_HEADCRAB_H
+#define NPC_HEADCRAB_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "ai_squadslot.h"
+#include "ai_basenpc.h"
+#include "soundent.h"
+
+
+
+abstract_class CBaseHeadcrab : public CAI_BaseNPC
+{
+	DECLARE_CLASS( CBaseHeadcrab, CAI_BaseNPC );
+
+public:
+	void Spawn( void );
+	void Precache( void );
+	void RunTask( const Task_t *pTask );
+	void StartTask( const Task_t *pTask );
+
+	void OnChangeActivity( Activity NewActivity );
+
+	bool IsFirmlyOnGround();
+	void MoveOrigin( const Vector &vecDelta );
+	void ThrowAt( const Vector &vecPos );
+	void ThrowThink( void );
+	virtual void JumpAttack( bool bRandomJump, const Vector &vecPos = vec3_origin, bool bThrown = false );
+	void JumpToBurrowHint( CAI_Hint *pHint );
+
+	bool	HasHeadroom();
+	void	LeapTouch ( CBaseEntity *pOther );
+	virtual void TouchDamage( CBaseEntity *pOther );
+	bool	CorpseGib( const CTakeDamageInfo &info );
+	void	Touch( CBaseEntity *pOther );
+	Vector	BodyTarget( const Vector &posSrc, bool bNoisy = true );
+	float	GetAutoAimRadius();
+	void	TraceAttack( const CTakeDamageInfo &info, const Vector &vecDir, trace_t *ptr, CDmgAccumulator *pAccumulator );
+	void	Ignite( float flFlameLifetime, bool bNPCOnly = true, float flSize = 0.0f, bool bCalledByLevelDesigner = false );
+
+	float	MaxYawSpeed( void );
+	void	GatherConditions( void );
+	void	PrescheduleThink( void );
+	Class_T Classify( void );
+	void	HandleAnimEvent( animevent_t *pEvent );
+	int		RangeAttack1Conditions ( float flDot, float flDist );
+	int		OnTakeDamage_Alive( const CTakeDamageInfo &info );
+	void	ClampRagdollForce( const Vector &vecForceIn, Vector *vecForceOut );
+	void	Event_Killed( const CTakeDamageInfo &info );
+	void	BuildScheduleTestBits( void );
+	bool	FValidateHintType( CAI_Hint *pHint );
+
+	bool	IsJumping( void ) { return m_bMidJump; }
+
+	virtual void BiteSound( void ) = 0;
+	virtual void AttackSound( void ) {};
+	virtual void ImpactSound( void ) {};
+	virtual void TelegraphSound( void ) {};
+
+	virtual int		SelectSchedule( void );
+	virtual int		SelectFailSchedule( int failedSchedule, int failedTask, AI_TaskFailureCode_t taskFailCode );
+	virtual int		TranslateSchedule( int scheduleType );
+
+	virtual float	GetReactionDelay( CBaseEntity *pEnemy ) { return 0.0; }
+
+	bool			HandleInteraction(int interactionType, void *data, CBaseCombatCharacter* sourceEnt);
+
+	void	CrawlFromCanister();
+
+	virtual	bool		AllowedToIgnite( void ) { return true; }
+
+	virtual bool CanBeAnEnemyOf( CBaseEntity *pEnemy );
+
+	bool	IsHangingFromCeiling( void ) 
+	{ 
+#ifdef HL2_EPISODIC
+		return m_bHangingFromCeiling;	
+#else
+		return false;
+#endif
+	}
+
+	virtual void PlayerHasIlluminatedNPC( CBasePlayer *pPlayer, float flDot );
+
+	void DropFromCeiling( void );
+
+	DEFINE_CUSTOM_AI;
+	DECLARE_DATADESC();
+
+protected:
+	void HeadcrabInit();
+
+	void Leap( const Vector &vecVel );
+
+	void GrabHintNode( CAI_Hint *pHint );
+	bool FindBurrow( const Vector &origin, float distance, bool excludeNear );
+	bool ValidBurrowPoint( const Vector &point );
+	void ClearBurrowPoint( const Vector &origin );
+	void Burrow( void );
+	void Unburrow( void );
+	void SetBurrowed( bool bBurrowed );
+	void JumpFromCanister();
+
+	// Begins the climb from the canister
+	void BeginClimbFromCanister();
+
+	void InputBurrow( inputdata_t &inputdata );
+	void InputBurrowImmediate( inputdata_t &inputdata );
+	void InputUnburrow( inputdata_t &inputdata );
+
+	void InputStartHangingFromCeiling( inputdata_t &inputdata );
+	void InputDropFromCeiling( inputdata_t &inputdata );
+
+	int CalcDamageInfo( CTakeDamageInfo *pInfo );
+	void CreateDust( bool placeDecal = true );
+
+	// Eliminates roll + pitch potentially in the headcrab at canister jump time
+	void EliminateRollAndPitch();
+
+	float InnateRange1MinRange( void );
+	float InnateRange1MaxRange( void );
+
+protected:
+	int		m_nGibCount;
+	float	m_flTimeDrown;
+	Vector	m_vecCommittedJumpPos;	// The position of our enemy when we locked in our jump attack.
+
+	float	m_flNextNPCThink;
+	float	m_flIgnoreWorldCollisionTime;
+
+	bool	m_bCommittedToJump;		// Whether we have 'locked in' to jump at our enemy.
+	bool	m_bCrawlFromCanister;
+	bool	m_bStartBurrowed;
+	bool	m_bBurrowed;
+	bool	m_bHidden;
+	bool	m_bMidJump;
+	bool	m_bAttackFailed;		// whether we ran into a wall during a jump.
+
+	float	m_flBurrowTime;
+	int		m_nContext;			// for FValidateHintType context
+	int		m_nJumpFromCanisterDir;
+
+	bool	m_bHangingFromCeiling;
+	float	m_flIlluminatedTime;
+};
+
+
+//=========================================================
+//=========================================================
+// The ever popular chubby classic headcrab
+//=========================================================
+//=========================================================
+class CHeadcrab : public CBaseHeadcrab
+{
+	DECLARE_CLASS( CHeadcrab, CBaseHeadcrab );
+
+public:
+	void Precache( void );
+	void Spawn( void );
+
+	float	MaxYawSpeed( void );
+	Activity NPC_TranslateActivity( Activity eNewActivity );
+
+	void	BiteSound( void );
+	void	PainSound( const CTakeDamageInfo &info );
+	void	DeathSound( const CTakeDamageInfo &info );
+	void	IdleSound( void );
+	void	AlertSound( void );
+	void	AttackSound( void );
+	void	TelegraphSound( void );
+};
+
+//=========================================================
+//=========================================================
+// The spindly, fast headcrab
+//=========================================================
+//=========================================================
+class CFastHeadcrab : public CBaseHeadcrab
+{
+	DECLARE_DATADESC();
+public:
+	DECLARE_CLASS( CFastHeadcrab, CBaseHeadcrab );
+
+	void	Precache( void );
+	void	Spawn( void );
+	bool	QuerySeeEntity(CBaseEntity *pSightEnt, bool bOnlyHateOrFearIfNPC = false);
+
+	float	MaxYawSpeed( void );
+
+	void	PrescheduleThink( void );
+	void	RunTask( const Task_t *pTask );
+	void	StartTask( const Task_t *pTask );
+
+	int		SelectSchedule( void );
+	int		TranslateSchedule( int scheduleType );
+
+	int		m_iRunMode;
+	float	m_flRealGroundSpeed;
+	float	m_flSlowRunTime;
+	float	m_flPauseTime;
+	Vector	m_vecJumpVel;
+
+	void	BiteSound( void );
+	void	PainSound( const CTakeDamageInfo &info );
+	void	DeathSound( const CTakeDamageInfo &info );
+	void	IdleSound( void );
+	void	AlertSound( void );
+	void	AttackSound( void );
+
+	enum SquadSlot_t
+	{	
+		SQUAD_SLOT_ENGAGE1 = LAST_SHARED_SQUADSLOT,
+		SQUAD_SLOT_ENGAGE2,
+		SQUAD_SLOT_ENGAGE3,
+		SQUAD_SLOT_ENGAGE4,
+	};
+
+	DEFINE_CUSTOM_AI;
+};
+
+
+//=========================================================
+//=========================================================
+// Treacherous black headcrab
+//=========================================================
+//=========================================================
+class CBlackHeadcrab : public CBaseHeadcrab
+{
+	DECLARE_CLASS( CBlackHeadcrab, CBaseHeadcrab );
+
+public:
+	void Eject( const QAngle &vecAngles, float flVelocityScale, CBaseEntity *pEnemy );
+	void EjectTouch( CBaseEntity *pOther );
+
+	//
+	// CBaseHeadcrab implementation.
+	//
+	void TouchDamage( CBaseEntity *pOther );
+	void BiteSound( void );
+	void AttackSound( void );
+
+	//
+	// CAI_BaseNPC implementation.
+	//
+	virtual void PrescheduleThink( void );
+	virtual void BuildScheduleTestBits( void );
+	virtual int SelectSchedule( void );
+	virtual int TranslateSchedule( int scheduleType );
+
+	virtual Activity NPC_TranslateActivity( Activity eNewActivity );
+	virtual void HandleAnimEvent( animevent_t *pEvent );
+	virtual float MaxYawSpeed( void );
+
+	virtual int	GetSoundInterests( void ) { return (BaseClass::GetSoundInterests() | SOUND_DANGER | SOUND_BULLET_IMPACT); }
+
+	bool IsHeavyDamage( const CTakeDamageInfo &info );
+
+	virtual void PainSound( const CTakeDamageInfo &info );
+	virtual void DeathSound( const CTakeDamageInfo &info );
+	virtual void IdleSound( void );
+	virtual void AlertSound( void );
+	virtual void ImpactSound( void );
+	virtual void TelegraphSound( void );
+#if HL2_EPISODIC
+	virtual bool FInViewCone( CBaseEntity *pEntity );
+#endif
+
+	//
+	// CBaseEntity implementation.
+	//
+	virtual void Precache( void );
+	virtual void Spawn( void );
+
+	DEFINE_CUSTOM_AI;
+	DECLARE_DATADESC();
+
+private:
+
+
+	void JumpFlinch( const Vector *pvecAwayFromPos );
+	void Panic( float flDuration );
+
+	bool m_bPanicState;
+	float m_flPanicStopTime;
+	float m_flNextHopTime;		// Keeps us from hopping too often due to damage.
+};
+
+
+#endif // NPC_HEADCRAB_H