diff --git a/source/games/duke/src/actors.cpp b/source/games/duke/src/actors.cpp
index 1f4edb72c..9a3be14b4 100644
--- a/source/games/duke/src/actors.cpp
+++ b/source/games/duke/src/actors.cpp
@@ -552,28 +552,26 @@ void moveplayers(void)
 
 void movefx(void)
 {
-	int i, j, p;
+	int p;
 	int x, ht;
 
-	StatIterator iti(STAT_FX);
-	while ((i = iti.NextIndex()) >= 0)
+	DukeStatIterator iti(STAT_FX);
+	while (auto act = iti.Next())
 	{
-		auto spri = &sprite[i];
-		auto act = &hittype[i];
-
+		auto spri = &act->s;
 		switch (spri->picnum)
 		{
 		case RESPAWN:
 			if (spri->extra == 66)
 			{
-				j = fi.spawn(i, spri->hitag);
+				auto j = spawn(act, spri->hitag);
 				if (isRRRA())
 				{
-					respawn_rrra(i, j);
+					respawn_rrra(act, j);
 				}
 				else
 				{
-					deletesprite(i);
+					deletesprite(act);
 				}
 			}
 			else if (spri->extra > (66 - 13))
@@ -592,7 +590,7 @@ void movefx(void)
 
 			if (spri->lotag >= 1000 && spri->lotag < 2000)
 			{
-				x = ldist(&sprite[ps[screenpeek].i], spri);
+				x = ldist(ps[screenpeek].GetActor(), act);
 				if (x < ht && act->temp_data[0] == 0)
 				{
 					FX_SetReverb(spri->lotag - 1000);
@@ -607,21 +605,21 @@ void movefx(void)
 			}
 			else if (spri->lotag < 999 && (unsigned)sector[spri->sectnum].lotag < ST_9_SLIDING_ST_DOOR && snd_ambience && sector[spri->sectnum].floorz != sector[spri->sectnum].ceilingz)
 			{
-				auto flags = S_GetUserFlags(spri->lotag);
+				int flags = S_GetUserFlags(spri->lotag);
 				if (flags & SF_MSFX)
 				{
-					int x = dist(&sprite[ps[screenpeek].i], spri);
+					int x = dist(ps[screenpeek].GetActor(), act);
 
 					if (x < ht && act->temp_data[0] == 0)
 					{
 						// Start playing an ambience sound.
-						S_PlayActorSound(spri->lotag, i, CHAN_AUTO, CHANF_LOOP);
+						S_PlayActorSound(spri->lotag, act, CHAN_AUTO, CHANF_LOOP);
 						act->temp_data[0] = 1;  // AMBIENT_SFX_PLAYING
 					}
 					else if (x >= ht && act->temp_data[0] == 1)
 					{
 						// Stop playing ambience sound because we're out of its range.
-						S_StopSound(spri->lotag, i);
+						S_StopSound(spri->lotag, act);
 					}
 				}
 
diff --git a/source/games/duke/src/actors_r.cpp b/source/games/duke/src/actors_r.cpp
index c9c63220a..6eb370c5a 100644
--- a/source/games/duke/src/actors_r.cpp
+++ b/source/games/duke/src/actors_r.cpp
@@ -784,10 +784,10 @@ int ifhitbyweapon_r(int sn)
 //
 //---------------------------------------------------------------------------
 
-void respawn_rrra(int i, int j)
+void respawn_rrra(DDukeActor* oldact, DDukeActor* newact)
 {
-	auto newspr = &sprite[j];
-	newspr->pal = sprite[i].pal;
+	auto newspr = &newact->s;
+	newspr->pal = oldact->s.pal;
 	if (newspr->picnum == MAMA)
 	{
 		if (newspr->pal == 30)
@@ -823,10 +823,10 @@ void respawn_rrra(int i, int j)
 
 	if (newspr->pal != 6)
 	{
-		deletesprite(i);
+		deletesprite(oldact);
 		return;
 	}
-	sprite[i].extra = (66 - 13);
+	oldact->s.extra = (66 - 13);
 	newspr->pal = 0;
 }
 
diff --git a/source/games/duke/src/funct.h b/source/games/duke/src/funct.h
index c7638fbe3..5b57f8f9b 100644
--- a/source/games/duke/src/funct.h
+++ b/source/games/duke/src/funct.h
@@ -91,7 +91,7 @@ void handle_se35(int i, int SMALLSMOKE, int EXPLOSION2);
 void handle_se128(int i);
 void handle_se130(int i, int countmax, int EXPLOSION2);
 
-void respawn_rrra(int i, int j);
+void respawn_rrra(DDukeActor* oldact, DDukeActor* newact);
 
 int dodge(spritetype*);
 void alterang(int a, int g_i, int g_p);