diff --git a/src/g_shared/a_armor.cpp b/src/g_shared/a_armor.cpp
index 6bed525d8..1475f86d2 100644
--- a/src/g_shared/a_armor.cpp
+++ b/src/g_shared/a_armor.cpp
@@ -211,16 +211,17 @@ void ABasicArmorPickup::Serialize (FArchive &arc)
 AInventory *ABasicArmorPickup::CreateCopy (AActor *other)
 {
 	ABasicArmorPickup *copy = static_cast<ABasicArmorPickup *> (Super::CreateCopy (other));
-	copy->SavePercent = SavePercent;
-	copy->SaveAmount = SaveAmount;
-	copy->MaxAbsorb = MaxAbsorb;
-	copy->MaxFullAbsorb = MaxFullAbsorb;
 
 	if (!(ItemFlags & IF_IGNORESKILL))
 	{
 		SaveAmount = FixedMul(SaveAmount, G_SkillProperty(SKILLP_ArmorFactor));
 	}
 
+	copy->SavePercent = SavePercent;
+	copy->SaveAmount = SaveAmount;
+	copy->MaxAbsorb = MaxAbsorb;
+	copy->MaxFullAbsorb = MaxFullAbsorb;
+
 	return copy;
 }
 
@@ -291,6 +292,12 @@ void ABasicArmorBonus::Serialize (FArchive &arc)
 AInventory *ABasicArmorBonus::CreateCopy (AActor *other)
 {
 	ABasicArmorBonus *copy = static_cast<ABasicArmorBonus *> (Super::CreateCopy (other));
+
+	if (!(ItemFlags & IF_IGNORESKILL))
+	{
+		SaveAmount = FixedMul(SaveAmount, G_SkillProperty(SKILLP_ArmorFactor));
+	}
+
 	copy->SavePercent = SavePercent;
 	copy->SaveAmount = SaveAmount;
 	copy->MaxSaveAmount = MaxSaveAmount;
@@ -299,10 +306,6 @@ AInventory *ABasicArmorBonus::CreateCopy (AActor *other)
 	copy->MaxAbsorb = MaxAbsorb;
 	copy->MaxFullAbsorb = MaxFullAbsorb;
 
-	if (!(ItemFlags & IF_IGNORESKILL))
-	{
-		SaveAmount = FixedMul(SaveAmount, G_SkillProperty(SKILLP_ArmorFactor));
-	}
 	return copy;
 }
 
diff --git a/src/p_acs.cpp b/src/p_acs.cpp
index bf480fe73..556592991 100644
--- a/src/p_acs.cpp
+++ b/src/p_acs.cpp
@@ -2759,6 +2759,7 @@ int DLevelScript::GetActorProperty (int tid, int property)
 							// so pretends it's normal.
 							return STYLE_Normal;
 	case APROP_Gravity:		return actor->gravity;
+	case APROP_Invulnerable:return !!(actor->flags2 & MF2_INVULNERABLE);
 	case APROP_Ambush:		return !!(actor->flags & MF_AMBUSH);
 	case APROP_Dropped:		return !!(actor->flags & MF_DROPPED);
 	case APROP_ChaseGoal:	return !!(actor->flags5 & MF5_CHASEGOAL);
@@ -2820,6 +2821,7 @@ int DLevelScript::CheckActorProperty (int tid, int property, int value)
 
 		// Boolean values need to compare to a binary version of value
 		case APROP_Ambush:
+		case APROP_Invulnerable:
 		case APROP_Dropped:
 		case APROP_ChaseGoal:
 		case APROP_Frightened:
diff --git a/src/po_man.cpp b/src/po_man.cpp
index 7619bd06a..da8399b3d 100644
--- a/src/po_man.cpp
+++ b/src/po_man.cpp
@@ -1245,6 +1245,7 @@ bool FPolyObj::CheckMobjBlocking (side_t *sd)
 	bool blocked;
 
 	ld = sd->linedef;
+
 	top = (ld->bbox[BOXTOP]-bmaporgy) >> MAPBLOCKSHIFT;
 	bottom = (ld->bbox[BOXBOTTOM]-bmaporgy) >> MAPBLOCKSHIFT;
 	left = (ld->bbox[BOXLEFT]-bmaporgx) >> MAPBLOCKSHIFT;
@@ -1294,6 +1295,17 @@ bool FPolyObj::CheckMobjBlocking (side_t *sd)
 						{
 							continue;
 						}
+						// We have a two-sided linedef so we should only check one side
+						// so that the thrust from both sides doesn't cancel each other out.
+						// Best use the one facing the player and ignore the back side.
+						if (ld->sidedef[1] != NULL)
+						{
+							int side = P_PointOnLineSide(mobj->x, mobj->y, ld);
+							if (ld->sidedef[side] != sd)
+							{
+								continue;
+							}
+						}
 						ThrustMobj (mobj, sd);
 						blocked = true;
 					}