diff --git a/polymer/eduke32/source/actors.h b/polymer/eduke32/source/actors.h
index 5cb8c47d7..7e3589573 100644
--- a/polymer/eduke32/source/actors.h
+++ b/polymer/eduke32/source/actors.h
@@ -76,16 +76,16 @@ enum uactortypes_t {
 
 // These macros are there to give names to the t_data[]/T*/vm.g_t[] indices
 // when used with actors. Greppability of source code is certainly a virtue.
-#define AC_COUNT(t) (t[0])  /* the actor's count */
+#define AC_COUNT(t) ((t)[0])  /* the actor's count */
 /* The ID of the actor's current move. In C-CON, the bytecode offset to the
  * move composite: */
-#define AC_MOVE_ID(t) (t[1])
-#define AC_ACTION_COUNT(t) (t[2])  /* the actor's action count */
-#define AC_CURFRAME(t) (t[3])  /* the actor's current frame offset */
+#define AC_MOVE_ID(t) ((t)[1])
+#define AC_ACTION_COUNT(t) ((t)[2])  /* the actor's action count */
+#define AC_CURFRAME(t) ((t)[3])  /* the actor's current frame offset */
 /* The ID of the actor's current action. In C-CON, the bytecode offset to the
  * action composite: */
-#define AC_ACTION_ID(t) (t[4])
-#define AC_AI_ID(t) (t[5])  /* the ID of the actor's current ai */
+#define AC_ACTION_ID(t) ((t)[4])
+#define AC_AI_ID(t) ((t)[5])  /* the ID of the actor's current ai */
 
 #ifdef LUNATIC
 struct action {
@@ -122,6 +122,18 @@ typedef struct {
     int32_t userdata; // 4b
 } projectile_t;
 
+// Select an actor's actiontics and movflags locations depending on
+// whether we compile the Lunatic build.
+// <spr>: sprite pointer
+// <a>: actor_t pointer
+#ifdef LUNATIC
+# define AC_ACTIONTICS(spr, a) ((a)->actiontics)
+# define AC_MOVFLAGS(spr, a) ((a)->movflags)
+#else
+# define AC_ACTIONTICS(spr, a) ((spr)->lotag)
+# define AC_MOVFLAGS(spr, a) ((spr)->hitag)
+#endif
+
 #pragma pack(push,1)
 // (+ 40 16 16 4 8 6 8 6 4 20)
 typedef struct {
@@ -131,7 +143,8 @@ typedef struct {
     // total: 16b
     struct move mv;
     struct action ac;
-    const int16_t padding_;
+    // Gets incremented by TICSPERFRAME on each A_Execute() call:
+    uint16_t actiontics;
 #endif
 
     int32_t flags; //4b
@@ -142,10 +155,17 @@ typedef struct {
     int16_t picnum,ang,extra,owner; //8b
     int16_t movflag,tempang,timetosleep; //6b
 
+    int16_t actorstayput, dispicnum;
+#if !defined LUNATIC
     // NOTE: shootzvel is not used any more.
-    int16_t actorstayput, dispicnum, shootzvel_, cgg; // 8b
-    int16_t lightId, lightcount, lightmaxrange; //6b
+    int16_t shootzvel_;
+#else
+    // Movement flags, sprite[i].hitag in C-CON:
+    uint16_t movflags;
+#endif
+    int16_t cgg;
 
+    int16_t lightId, lightcount, lightmaxrange; //6b
 #ifdef POLYMER
     _prlight *lightptr; //4b/8b
 #else
@@ -180,7 +200,7 @@ typedef struct {
 #ifdef LUNATIC
     struct move mv;
     struct action ac;
-    const int16_t padding_;
+    uint16_t actiontics;
 #endif
 
     int32_t flags; //4b
@@ -191,7 +211,13 @@ typedef struct {
     int16_t picnum,ang,extra,owner; //8b
     int16_t movflag,tempang,timetosleep; // 6b
 
-    int16_t actorstayput, dispicnum, shootzvel_, cgg; // 8b
+    int16_t actorstayput, dispicnum;
+#if !defined LUNATIC
+    int16_t shootzvel_;
+#else
+    uint16_t movflags;
+#endif
+    int16_t cgg;
 
     spritetype sprite;
     int16_t netIndex;
diff --git a/polymer/eduke32/source/game.c b/polymer/eduke32/source/game.c
index 29d8edcd1..6ba79c68f 100644
--- a/polymer/eduke32/source/game.c
+++ b/polymer/eduke32/source/game.c
@@ -4807,7 +4807,7 @@ static int32_t G_InitActor(int32_t i, int32_t tilenum, int32_t set_movflag_uncon
         AC_ACTION_ID(actor[i].t_data) = *(g_tile[tilenum].execPtr+1);
         AC_MOVE_ID(actor[i].t_data) = *(g_tile[tilenum].execPtr+2);
 
-        if (set_movflag_uncond || SHT == 0)
+        if (set_movflag_uncond || SHT == 0)  // AC_MOVFLAGS
             SHT = *(g_tile[tilenum].execPtr+3);
 
         return 1;
@@ -4817,6 +4817,7 @@ static int32_t G_InitActor(int32_t i, int32_t tilenum, int32_t set_movflag_uncon
     {
         // ^^^ C-CON takes precedence for now.
         const el_actor_t *a = &g_elActors[tilenum];
+        uint16_t *movflagsptr = &AC_MOVFLAGS(&sprite[i], &actor[i]);
 
         SH = a->strength;
         AC_ACTION_ID(actor[i].t_data) = a->act.id;
@@ -4824,8 +4825,8 @@ static int32_t G_InitActor(int32_t i, int32_t tilenum, int32_t set_movflag_uncon
         Bmemcpy(&actor[i].ac, &a->act.ac, sizeof(struct action));
         Bmemcpy(&actor[i].mv, &a->mov.mv, sizeof(struct move));
 
-        if (set_movflag_uncond || SHT == 0)
-            SHT = a->movflags;
+        if (set_movflag_uncond || *movflagsptr == 0)
+            *movflagsptr = a->movflags;
 
         return 1;
     }
@@ -5999,6 +6000,8 @@ int32_t A_Spawn(int32_t j, int32_t pn)
                 }
             }
 
+            // If spawned from parent sprite (as opposed to 'from premap'),
+            // ignore skill.
             if (j >= 0) sp->lotag = 0;
 
             if ((sp->lotag > ud.player_skill) || ud.monsters_off == 1)
diff --git a/polymer/eduke32/source/gameexec.c b/polymer/eduke32/source/gameexec.c
index 8c0fa80db..062b540a6 100644
--- a/polymer/eduke32/source/gameexec.c
+++ b/polymer/eduke32/source/gameexec.c
@@ -594,7 +594,8 @@ GAMEEXEC_STATIC void VM_Move(void)
 #endif
     // NOTE: commented out condition is dead since r3159 (making hi/lotag unsigned).
     // XXX: Does it break anything? Where are movflags with all bits set created?
-    const int32_t movflags = /*(vm.g_sp->hitag==-1) ? 0 :*/ vm.g_sp->hitag;
+    const uint16_t *movflagsptr = &AC_MOVFLAGS(vm.g_sp, &actor[vm.g_i]);
+    const int32_t movflags = /*(*movflagsptr==-1) ? 0 :*/ *movflagsptr;
     const int32_t deadflag = (A_CheckEnemySprite(vm.g_sp) && vm.g_sp->extra <= 0);
     int32_t badguyp, angdif;
 
@@ -2236,7 +2237,7 @@ nullquote:
                         // offsets
                         AC_ACTION_ID(a->t_data) = actorptr[1];
                         AC_MOVE_ID(a->t_data) = actorptr[2];
-                        sprite[i].hitag = actorptr[3];  // ai bits (movflags)
+                        AC_MOVFLAGS(&sprite[i], &actor[i]) = actorptr[3];  // ai bits (movflags)
                     }
                 }
 
@@ -5381,12 +5382,13 @@ void A_Execute(int32_t iActor,int32_t iPlayer,int32_t lDist)
         const int32_t action_incval = actor[vm.g_i].ac.incval;
         const int32_t action_delay = actor[vm.g_i].ac.delay;
 #endif
-        vm.g_sp->lotag += TICSPERFRAME;
+        uint16_t *actionticsptr = &AC_ACTIONTICS(vm.g_sp, &actor[vm.g_i]);
+        *actionticsptr += TICSPERFRAME;
 
-        if (vm.g_sp->lotag > action_delay)
+        if (*actionticsptr > action_delay)
         {
             AC_ACTION_COUNT(vm.g_t)++;
-            vm.g_sp->lotag = 0;
+            *actionticsptr = 0;
 
             AC_CURFRAME(vm.g_t) += action_incval;
         }
diff --git a/polymer/eduke32/source/lunatic/defs.ilua b/polymer/eduke32/source/lunatic/defs.ilua
index 8c70bee6d..06c7332d4 100644
--- a/polymer/eduke32/source/lunatic/defs.ilua
+++ b/polymer/eduke32/source/lunatic/defs.ilua
@@ -155,7 +155,7 @@ __attribute__((packed)) struct {
     const int32_t t_data[10];
     const struct move mv;
     const struct action ac;
-    const int16_t _padding[1];
+    const uint16_t actiontics;
 
 ]]..defs_c.bitint_member("SBit32", "flags")..[[
     vec3_t bpos; //12b
@@ -169,10 +169,15 @@ __attribute__((packed)) struct {
 
     int16_t stayputsect;
     const int16_t dispicnum;
-    int16_t shootzvel, cgg;
+    // Movement flags, sprite[i].hitag in C-CON.
+    // XXX: more research where it was used in EDuke32's C code? (also .lotag <-> actiontics)
+    // XXX: what if CON code knew of the above implementation detail?
+]]..defs_c.bitint_member("UBit16", "movflags")..[[
+    int16_t cgg;
 
     const int16_t lightId, lightcount, lightmaxrange;
     const union { intptr_t ptr; uint64_t dummy; } _light;
+// XXX: 32-bit has filler
 }
 ]]
 
@@ -1001,11 +1006,11 @@ local actor_mt = {
             end
 
             a.t_data[0] = 0
+            a.movflags = movflags or 0
             local spr = ffiC.sprite[get_actor_idx(a)]
-            spr.hitag = movflags or 0
 
             if (not spr:isenemy() or spr.extra > 0) then
-                if (bit.band(spr.hitag, 8) ~= 0) then  -- random_angle
+                if (bit.band(a.movflags, 8) ~= 0) then  -- random_angle
                     spr.ang = bit.band(ffiC.krand(), 2047)
                 end
             end
diff --git a/polymer/eduke32/source/lunatic/test.elua b/polymer/eduke32/source/lunatic/test.elua
index 30f4e6405..7fd51d6a3 100644
--- a/polymer/eduke32/source/lunatic/test.elua
+++ b/polymer/eduke32/source/lunatic/test.elua
@@ -456,7 +456,7 @@ gameactor
 
         if (actr:has_action(CAC.ATROOPWALKING)) then
             if (actr:get_count() % 50 == 0) then
-                spr.hitag = bit.bxor(spr.hitag, actor.MOVFLAGS.spin)
+                actr.movflagsbits:flip(actor.MOVFLAGS.spin)
             end
         end
     end
@@ -468,13 +468,14 @@ gameactor
 
     -- XXX: I want to write "{0, 4, delay=20}"
     action = con.action{0, 4, 1, 1, 20},
-    move = con.move{},  -- so that the ID is nonzero
+    move = con.move{},  -- so that the ID is nonzero and it will move
 
     func = function(aci)
+        local a = actor[aci]
         local delay = math.sin(0.1 * 2*math.pi*gv.totalclock/120)
-        actor[aci]:set_action_delay(20 + 10*delay)
-        actor[aci]:set_hvel(50*delay)
-        sprite[aci].hitag = actor.MOVFLAGS.geth
+        a:set_action_delay(20 + 10*delay)
+        a:set_hvel(50*delay)
+        a.movflags = actor.MOVFLAGS.geth
     end,
 }