diff --git a/src/menu/menu.cpp b/src/menu/menu.cpp
index 676057321..a8dac6b54 100644
--- a/src/menu/menu.cpp
+++ b/src/menu/menu.cpp
@@ -270,6 +270,7 @@ bool DMenu::CallMenuEvent(int mkey, bool fromcontroller)
 
 void DMenu::Close ()
 {
+	if (DMenu::CurrentMenu == nullptr) return;	// double closing can happen in the save menu.
 	assert(DMenu::CurrentMenu == this);
 	DMenu::CurrentMenu = mParentMenu;
 	Destroy();
diff --git a/src/p_actionfunctions.cpp b/src/p_actionfunctions.cpp
index 40629bfcb..15e82a56c 100644
--- a/src/p_actionfunctions.cpp
+++ b/src/p_actionfunctions.cpp
@@ -1410,26 +1410,6 @@ DEFINE_ACTION_FUNCTION(AActor, A_RadiusDamageSelf)
 	return 0;
 }
 
-//==========================================================================
-//
-// Execute a line special / script
-//
-//==========================================================================
-DEFINE_ACTION_FUNCTION(AActor, A_CallSpecial)
-{
-	PARAM_SELF_PROLOGUE(AActor);
-	PARAM_INT		(special);
-	PARAM_INT_DEF	(arg1);
-	PARAM_INT_DEF	(arg2);
-	PARAM_INT_DEF	(arg3);
-	PARAM_INT_DEF	(arg4);
-	PARAM_INT_DEF	(arg5);
-
-	bool res = !!P_ExecuteSpecial(special, NULL, self, false, arg1, arg2, arg3, arg4, arg5);
-
-	ACTION_RETURN_BOOL(res);
-}
-
 //==========================================================================
 //
 // The ultimate code pointer: Fully customizable missiles!
diff --git a/src/p_lnspec.cpp b/src/p_lnspec.cpp
index e71cf2f79..6f44cedcd 100644
--- a/src/p_lnspec.cpp
+++ b/src/p_lnspec.cpp
@@ -3717,3 +3717,27 @@ int P_ExecuteSpecial(int			num,
 	}
 	return 0;
 }
+
+//==========================================================================
+//
+// Execute a line special / script
+//
+//==========================================================================
+DEFINE_ACTION_FUNCTION(FLevelLocals, ExecuteSpecial)
+{
+	PARAM_SELF_STRUCT_PROLOGUE(FLevelLocals);
+	PARAM_INT(special);
+	PARAM_OBJECT(activator, AActor);
+	PARAM_POINTER(linedef, line_t);
+	PARAM_BOOL(lineside);
+	PARAM_INT_DEF(arg1);
+	PARAM_INT_DEF(arg2);
+	PARAM_INT_DEF(arg3);
+	PARAM_INT_DEF(arg4);
+	PARAM_INT_DEF(arg5);
+
+	bool res = !!P_ExecuteSpecial(special, linedef, activator, lineside, arg1, arg2, arg3, arg4, arg5);
+
+	ACTION_RETURN_BOOL(res);
+}
+
diff --git a/src/p_trace.cpp b/src/p_trace.cpp
index 3597535e5..818372e74 100644
--- a/src/p_trace.cpp
+++ b/src/p_trace.cpp
@@ -41,6 +41,7 @@
 #include "r_defs.h"
 #include "p_spec.h"
 #include "g_levellocals.h"
+#include "p_terrain.h"
 
 //==========================================================================
 //
@@ -135,6 +136,13 @@ static void GetPortalTransition(DVector3 &pos, sector_t *&sec)
 	}
 }
 
+static bool isLiquid(F3DFloor *ff)
+{
+	if (ff->flags & FF_SWIMMABLE) return true;
+	auto terrain = ff->model->GetTerrain(ff->flags & FF_INVERTPLANES ? sector_t::floor : sector_t::ceiling);
+	return Terrains[terrain].IsLiquid && Terrains[terrain].Splash != -1;
+}
+
 //==========================================================================
 //
 // Trace entry point
@@ -300,9 +308,9 @@ void FTraceInfo::Setup3DFloors()
 			if (!(rover->flags&FF_EXISTS))
 				continue;
 
-			if (rover->flags&FF_SWIMMABLE && Results->Crossed3DWater == NULL)
+			if (Results->Crossed3DWater == NULL)
 			{
-				if (Check3DFloorPlane(rover, false))
+				if (Check3DFloorPlane(rover, false) && isLiquid(rover))
 				{
 					// only consider if the plane is above the actual floor.
 					if (rover->top.plane->ZatPoint(Results->HitPos) > bf)
@@ -767,7 +775,7 @@ bool FTraceInfo::TraceTraverse (int ptflags)
 		{
 			for (auto rover : CurSector->e->XFloor.ffloors)
 			{
-				if ((rover->flags & FF_EXISTS) && (rover->flags&FF_SWIMMABLE))
+				if ((rover->flags & FF_EXISTS) && isLiquid(rover))
 				{
 					if (Check3DFloorPlane(rover, false))
 					{
diff --git a/wadsrc/static/zscript/actor.txt b/wadsrc/static/zscript/actor.txt
index feb61807b..413cdc816 100644
--- a/wadsrc/static/zscript/actor.txt
+++ b/wadsrc/static/zscript/actor.txt
@@ -738,7 +738,11 @@ class Actor : Thinker native
 	native void A_VileChase();
 	native void A_BossDeath();
 	native void A_Detonate();
-	native bool A_CallSpecial(int special, int arg1=0, int arg2=0, int arg3=0, int arg4=0, int arg5=0);
+	bool A_CallSpecial(int special, int arg1=0, int arg2=0, int arg3=0, int arg4=0, int arg5=0)
+	{
+		return Level.ExecuteSpecial(special, self, null, false, arg1, arg2, arg3, arg4, arg5);
+	}
+
 
 	native void A_ActiveSound();
 
diff --git a/wadsrc/static/zscript/base.txt b/wadsrc/static/zscript/base.txt
index bffee91f0..7b872f472 100644
--- a/wadsrc/static/zscript/base.txt
+++ b/wadsrc/static/zscript/base.txt
@@ -469,6 +469,7 @@ struct LevelLocals native
 	native String GetUDMFString(int type, int index, Name key);
 	native int GetUDMFInt(int type, int index, Name key);
 	native double GetUDMFFloat(int type, int index, Name key);
+	native bool ExecuteSpecial(int special, Actor activator, line linedef, bool lineside, int arg1 = 0, int arg2 = 0, int arg3 = 0, int arg4 = 0, int arg5 = 0);
 
 }
 
diff --git a/wadsrc/static/zscript/inventory/powerups.txt b/wadsrc/static/zscript/inventory/powerups.txt
index d355a5e14..828113ac8 100644
--- a/wadsrc/static/zscript/inventory/powerups.txt
+++ b/wadsrc/static/zscript/inventory/powerups.txt
@@ -1767,7 +1767,7 @@ class PowerProtection : Powerup
 	{
 		if (passive && damage > 0)
 		{
-			newdamage = max(1, ApplyDamageFactors(GetClass(), damageType, damage, damage / 4));
+			newdamage = max(0, ApplyDamageFactors(GetClass(), damageType, damage, damage / 4));
 			if (Owner != null && newdamage < damage) Owner.A_PlaySound(ActiveSound, CHAN_AUTO, 1.0, false, ATTN_NONE);
 		}
 	}
diff --git a/wadsrc/static/zscript/shared/movingcamera.txt b/wadsrc/static/zscript/shared/movingcamera.txt
index 15fdd0836..c6af13b42 100644
--- a/wadsrc/static/zscript/shared/movingcamera.txt
+++ b/wadsrc/static/zscript/shared/movingcamera.txt
@@ -311,7 +311,7 @@ class PathFollower : Actor
 
 		while ( (spec = InterpolationSpecial(iterator.Next ())) )
 		{
-			A_CallSpecial(spec.special, spec.args[0], spec.args[1], spec.args[2], spec.args[3], spec.args[4]);
+			Level.ExecuteSpecial(spec.special, null, null, false, spec.args[0], spec.args[1], spec.args[2], spec.args[3], spec.args[4]);
 		}
 	}