diff --git a/src/p_enemy.cpp b/src/p_enemy.cpp
index 04d2b261b5..986268c7ee 100644
--- a/src/p_enemy.cpp
+++ b/src/p_enemy.cpp
@@ -317,56 +317,6 @@ DEFINE_ACTION_FUNCTION(AActor, CheckMeleeRange)
 	ACTION_RETURN_INT(self->CheckMeleeRange());
 }
 
-//----------------------------------------------------------------------------
-//
-// FUNC P_CheckMeleeRange2
-//
-//----------------------------------------------------------------------------
-
-bool P_CheckMeleeRange2 (AActor *actor)
-{
-	AActor *mo;
-	double dist;
-
-
-	if (!actor->target || (actor->Sector->Flags & SECF_NOATTACK))
-	{
-		return false;
-	}
-	mo = actor->target;
-	dist = mo->Distance2D (actor);
-	if (dist >= 128 || dist < actor->meleerange + mo->radius)
-	{
-		return false;
-	}
-	if (mo->Z() > actor->Top())
-	{ // Target is higher than the attacker
-		return false;
-	}
-	else if (actor->Z() > mo->Top())
-	{ // Attacker is higher
-		return false;
-	}
-	else if (actor->IsFriend(mo))
-	{
-		// killough 7/18/98: friendly monsters don't attack other friends
-		return false;
-	}
-
-	if (!P_CheckSight(actor, mo))
-	{
-		return false;
-	}
-	return true;
-}
-
-DEFINE_ACTION_FUNCTION(AActor, CheckMeleeRange2)
-{
-	PARAM_SELF_PROLOGUE(AActor);
-	ACTION_RETURN_INT(P_CheckMeleeRange2(self));
-}
-
-
 //=============================================================================
 //
 // P_CheckMissileRange
diff --git a/wadsrc/static/zscript/actor.txt b/wadsrc/static/zscript/actor.txt
index 86d916348e..07e409dd89 100644
--- a/wadsrc/static/zscript/actor.txt
+++ b/wadsrc/static/zscript/actor.txt
@@ -663,7 +663,6 @@ class Actor : Thinker native
 
 	native void SetIdle(bool nofunction = false);
 	native bool CheckMeleeRange();
-	native bool CheckMeleeRange2();
 	native virtual int DamageMobj(Actor inflictor, Actor source, int damage, Name mod, int flags = 0, double angle = 0);
 	native void PoisonMobj (Actor inflictor, Actor source, int damage, int duration, int period, Name type);
 	native double AimLineAttack(double angle, double distance, out FTranslatedLineTarget pLineTarget = null, double vrange = 0., int flags = 0, Actor target = null, Actor friender = null);
diff --git a/wadsrc/static/zscript/hexen/serpent.txt b/wadsrc/static/zscript/hexen/serpent.txt
index 9d68263811..7688dbd0ef 100644
--- a/wadsrc/static/zscript/hexen/serpent.txt
+++ b/wadsrc/static/zscript/hexen/serpent.txt
@@ -290,6 +290,50 @@ class Serpent : Actor
 	}
 }
 
+extend class Actor
+{
+	//----------------------------------------------------------------------------
+	//
+	// FUNC P_CheckMeleeRange2
+	//
+	// This belongs to the Serpent but was initially exported on Actor
+	// so it needs to remain there.
+	//
+	//----------------------------------------------------------------------------
+
+	bool CheckMeleeRange2 ()
+	{
+		Actor mo;
+		double dist;
+
+
+		if (!target || (CurSector.Flags & Sector.SECF_NOATTACK))
+		{
+			return false;
+		}
+		mo = target;
+		dist = mo.Distance2D (self);
+		if (dist >= 128 || dist < meleerange + mo.radius)
+		{
+			return false;
+		}
+		if (mo.pos.Z > pos.Z + height)
+		{ // Target is higher than the attacker
+			return false;
+		}
+		else if (pos.Z > mo.pos.Z + mo.height)
+		{ // Attacker is higher
+			return false;
+		}
+		else if (IsFriend(mo))
+		{
+			// killough 7/18/98: friendly monsters don't attack other friends
+			return false;
+		}
+		return CheckSight(mo);
+	}
+}
+
 // Serpent Leader -----------------------------------------------------------
 
 class SerpentLeader : Serpent
diff --git a/wadsrc/static/zscript/mapdata.txt b/wadsrc/static/zscript/mapdata.txt
index cf2458c10b..601031f222 100644
--- a/wadsrc/static/zscript/mapdata.txt
+++ b/wadsrc/static/zscript/mapdata.txt
@@ -334,6 +334,7 @@ struct Sector native play
 		SECF_ENDGODMODE		= 256,	// getting damaged by this sector ends god mode
 		SECF_ENDLEVEL		= 512,	// ends level when health goes below 10
 		SECF_HAZARD			= 1024,	// Change to Strife's delayed damage handling.
+		SECF_NOATTACK		= 2048,	// monsters cannot start attacks in this sector.
 
 		SECF_WASSECRET		= 1 << 30,	// a secret that was discovered
 		SECF_SECRET			= 1 << 31,	// a secret sector