diff --git a/spec b/spec
index c4b69ae8e..91212d5ff 100644
--- a/spec
+++ b/spec
@@ -2244,8 +2244,7 @@ beginseg
     name "ovl_Bg_Fire_Wall"
     compress
     include "build/src/overlays/actors/ovl_Bg_Fire_Wall/z_bg_fire_wall.o"
-    include "build/data/ovl_Bg_Fire_Wall/ovl_Bg_Fire_Wall.data.o"
-    include "build/data/ovl_Bg_Fire_Wall/ovl_Bg_Fire_Wall.reloc.o"
+    include "build/src/overlays/actors/ovl_Bg_Fire_Wall/ovl_Bg_Fire_Wall_reloc.o"
 endseg
 
 beginseg
diff --git a/src/overlays/actors/ovl_Bg_Fire_Wall/z_bg_fire_wall.c b/src/overlays/actors/ovl_Bg_Fire_Wall/z_bg_fire_wall.c
index 9e87d66bb..1ad295e68 100644
--- a/src/overlays/actors/ovl_Bg_Fire_Wall/z_bg_fire_wall.c
+++ b/src/overlays/actors/ovl_Bg_Fire_Wall/z_bg_fire_wall.c
@@ -5,6 +5,8 @@
  */
 
 #include "z_bg_fire_wall.h"
+#include "objects/object_fwall/object_fwall.h"
+#include "overlays/actors/ovl_En_Encount4/z_en_encount4.h"
 
 #define FLAGS 0x00000000
 
@@ -12,14 +14,13 @@
 
 void BgFireWall_Init(Actor* thisx, PlayState* play);
 void BgFireWall_Destroy(Actor* thisx, PlayState* play);
-void BgFireWall_Update(Actor* thisx, PlayState* play);
+void BgFireWall_Update(Actor* thisx, PlayState* play2);
+void BgFireWall_Draw(Actor* thisx, PlayState* play);
 
 void func_809AC638(BgFireWall* this, PlayState* play);
 void func_809AC68C(BgFireWall* this, PlayState* play);
 void func_809AC6C0(BgFireWall* this, PlayState* play);
-void func_809AC970(BgFireWall* this, PlayState* play);
 
-#if 0
 const ActorInit Bg_Fire_Wall_InitVars = {
     ACTOR_BG_FIRE_WALL,
     ACTORCAT_BG,
@@ -32,41 +33,184 @@ const ActorInit Bg_Fire_Wall_InitVars = {
     (ActorFunc)NULL,
 };
 
-// static ColliderCylinderInit sCylinderInit = {
-static ColliderCylinderInit D_809ACC60 = {
-    { COLTYPE_NONE, AT_ON | AT_TYPE_ENEMY, AC_NONE, OC1_ON | OC1_TYPE_PLAYER, OC2_TYPE_2, COLSHAPE_CYLINDER, },
-    { ELEMTYPE_UNK0, { 0x20000000, 0x01, 0x04 }, { 0xF7CFFFFF, 0x00, 0x00 }, TOUCH_ON | TOUCH_SFX_NONE, BUMP_NONE, OCELEM_ON, },
+static ColliderCylinderInit sCylinderInit = {
+    {
+        COLTYPE_NONE,
+        AT_ON | AT_TYPE_ENEMY,
+        AC_NONE,
+        OC1_ON | OC1_TYPE_PLAYER,
+        OC2_TYPE_2,
+        COLSHAPE_CYLINDER,
+    },
+    {
+        ELEMTYPE_UNK0,
+        { 0x20000000, 0x01, 0x04 },
+        { 0xF7CFFFFF, 0x00, 0x00 },
+        TOUCH_ON | TOUCH_SFX_NONE,
+        BUMP_NONE,
+        OCELEM_ON,
+    },
     { 34, 85, 0, { 0, 0, 0 } },
 };
 
-// sColChkInfoInit
-static CollisionCheckInfoInit D_809ACC8C = { 1, 80, 100, MASS_IMMOVABLE };
+static CollisionCheckInfoInit sColChkInfoInit = { 1, 80, 100, MASS_IMMOVABLE };
 
-#endif
+static TexturePtr sFlameTextures[] = {
+    gFwallFireball0Tex, gFwallFireball1Tex, gFwallFireball2Tex, gFwallFireball3Tex,
+    gFwallFireball4Tex, gFwallFireball5Tex, gFwallFireball6Tex, gFwallFireball7Tex,
+};
 
-extern ColliderCylinderInit D_809ACC60;
-extern CollisionCheckInfoInit D_809ACC8C;
+void BgFireWall_Init(Actor* thisx, PlayState* play) {
+    BgFireWall* this = THIS;
 
-extern UNK_TYPE D_06000040;
+    this->unk_14C = this->actor.params;
+    this->actor.scale.y = 0.005f;
+    Collider_InitCylinder(play, &this->collider);
+    Collider_SetCylinder(play, &this->collider, &this->actor, &sCylinderInit);
+    CollisionCheck_SetInfo(&this->actor.colChkInfo, NULL, &sColChkInfoInit);
+    this->actor.scale.z = 0.12f;
+    this->actor.scale.x = 0.12f;
+    this->unk_15C = 0.09f;
+    this->unk_158 = 0.1f;
+    this->unk_160 = 300.0f;
+    this->texIndex = Rand_S16Offset(0, ARRAY_COUNT(sFlameTextures) - 1);
+    this->actor.flags |= ACTOR_FLAG_10;
+    this->collider.dim.pos.y = this->actor.world.pos.y;
+    this->actionFunc = func_809AC638;
+}
 
-#pragma GLOBAL_ASM("asm/non_matchings/overlays/ovl_Bg_Fire_Wall/BgFireWall_Init.s")
+void BgFireWall_Destroy(Actor* thisx, PlayState* play) {
+    BgFireWall* this = THIS;
 
-#pragma GLOBAL_ASM("asm/non_matchings/overlays/ovl_Bg_Fire_Wall/BgFireWall_Destroy.s")
+    Collider_DestroyCylinder(play, &this->collider);
+}
 
-#pragma GLOBAL_ASM("asm/non_matchings/overlays/ovl_Bg_Fire_Wall/func_809AC5C0.s")
+s32 func_809AC5C0(BgFireWall* thisx, PlayState* play) {
+    BgFireWall* this = THIS;
+    Player* player = GET_PLAYER(play);
+    Vec3f sp1C;
 
-#pragma GLOBAL_ASM("asm/non_matchings/overlays/ovl_Bg_Fire_Wall/func_809AC638.s")
+    Actor_OffsetOfPointInActorCoords(&this->actor, &sp1C, &player->actor.world.pos);
+    if ((fabsf(sp1C.x) < this->unk_160) && (fabsf(sp1C.z) < (this->unk_160 + 20.0f))) {
+        return true;
+    }
+    return false;
+}
 
-#pragma GLOBAL_ASM("asm/non_matchings/overlays/ovl_Bg_Fire_Wall/func_809AC68C.s")
+void func_809AC638(BgFireWall* this, PlayState* play) {
+    if ((this->unk_14C != 0) || (func_809AC5C0(this, play))) {
+        this->actor.draw = BgFireWall_Draw;
+        this->timer = 5;
+        this->actionFunc = func_809AC68C;
+    }
+}
 
-#pragma GLOBAL_ASM("asm/non_matchings/overlays/ovl_Bg_Fire_Wall/func_809AC6C0.s")
+void func_809AC68C(BgFireWall* this, PlayState* play) {
+    if (this->timer != 0) {
+        this->timer--;
+    }
+    if (this->timer == 0) {
+        this->actionFunc = func_809AC6C0;
+    }
+}
 
-#pragma GLOBAL_ASM("asm/non_matchings/overlays/ovl_Bg_Fire_Wall/func_809AC760.s")
+void func_809AC6C0(BgFireWall* this, PlayState* play) {
+    if ((this->unk_14C != 0) || (func_809AC5C0(this, play))) {
+        this->unk_15C = 0.09f;
+        Math_StepToF(&this->actor.scale.y, this->unk_15C + this->unk_154, this->unk_158);
+    } else if (Math_StepToF(&this->actor.scale.y, 0.005f, this->unk_158)) {
+        this->actionFunc = func_809AC638;
+    } else {
+        this->timer = 0;
+    }
+}
 
-#pragma GLOBAL_ASM("asm/non_matchings/overlays/ovl_Bg_Fire_Wall/func_809AC7F8.s")
+void func_809AC760(BgFireWall* this, PlayState* play) {
+    s16 phi_a3;
 
-#pragma GLOBAL_ASM("asm/non_matchings/overlays/ovl_Bg_Fire_Wall/func_809AC970.s")
+    if (Actor_IsFacingPlayer(&this->actor, 0x4000)) {
+        phi_a3 = this->actor.shape.rot.y;
+    } else {
+        phi_a3 = (this->actor.shape.rot.y + 0x8000);
+    }
+    func_800B8D98(play, &this->actor, BREG(48) + 10.0f, phi_a3, BREG(49) + 5.0f);
+}
 
-#pragma GLOBAL_ASM("asm/non_matchings/overlays/ovl_Bg_Fire_Wall/BgFireWall_Update.s")
+void func_809AC7F8(BgFireWall* this, PlayState* play) {
+    Player* player = GET_PLAYER(play);
+    Vec3f sp38;
+    f32 val = 25.0f;
+    f32 sin;
+    f32 cos;
 
-#pragma GLOBAL_ASM("asm/non_matchings/overlays/ovl_Bg_Fire_Wall/func_809ACB28.s")
+    Actor_OffsetOfPointInActorCoords(&this->actor, &sp38, &player->actor.world.pos);
+    sp38.x = CLAMP(sp38.x, -80.0f, 80.0f);
+
+    if (this->step == 0) {
+        if (sp38.z > 0.0f) {
+            sp38.z = -val;
+            this->step = -1.0f;
+        } else {
+            sp38.z = val;
+            this->step = 1.0f;
+        }
+    } else {
+        sp38.z = this->step * 25.0f;
+    }
+
+    sin = Math_SinS(this->actor.shape.rot.y);
+    cos = Math_CosS(this->actor.shape.rot.y);
+    this->collider.dim.pos.x = this->actor.world.pos.x + (sp38.x * cos) + (sp38.z * sin);
+    this->collider.dim.pos.z = this->actor.world.pos.z - (sp38.x * sin) + (sp38.z * cos);
+}
+
+void func_809AC970(BgFireWall* this, PlayState* play) {
+    if (Math_StepToF(&this->actor.scale.y, 0.005f, this->unk_158)) {
+        Actor_MarkForDeath(&this->actor);
+    }
+}
+
+void BgFireWall_Update(Actor* thisx, PlayState* play2) {
+    PlayState* play = play2;
+    BgFireWall* this = THIS;
+
+    this->actionFunc(this, play);
+    if ((this->unk_14C == 0) || ((this->unk_14C != 0) && (this->actor.xzDistToPlayer < 240.0f))) {
+        if (this->collider.base.atFlags & AT_HIT) {
+            this->collider.base.atFlags &= ~AT_HIT;
+            func_809AC760(this, play);
+        }
+    }
+    if (this->actionFunc == func_809AC6C0) {
+        func_800B9010(&this->actor, NA_SE_EV_FIRE_PLATE - SFX_FLAG);
+        if ((this->unk_14C == 0) || ((this->unk_14C != 0) && (this->actor.xzDistToPlayer < 240.0f))) {
+            func_809AC7F8(this, play);
+            CollisionCheck_SetAT(play, &play->colChkCtx, &this->collider.base);
+            CollisionCheck_SetOC(play, &play->colChkCtx, &this->collider.base);
+        }
+    }
+    this->texIndex = (this->texIndex + 1) % ARRAY_COUNT(sFlameTextures);
+    if (this->actionFunc != func_809AC970) {
+        if (this->actor.parent != NULL) {
+            EnEncount4* parent = (EnEncount4*)this->actor.parent;
+            if ((parent->actor.update != NULL) && (parent->unk_150 != 0)) {
+                this->actionFunc = func_809AC970;
+            }
+        }
+    }
+}
+
+void BgFireWall_Draw(Actor* thisx, PlayState* play) {
+    BgFireWall* this = THIS;
+
+    OPEN_DISPS(play->state.gfxCtx);
+
+    POLY_XLU_DISP = Gfx_CallSetupDL(POLY_XLU_DISP, 20);
+    gSPSegment(POLY_XLU_DISP++, 0x08, Lib_SegmentedToVirtual(sFlameTextures[this->texIndex]));
+    gDPSetPrimColor(POLY_XLU_DISP++, 0, 0x01, 255, 255, 0, 150);
+    gDPSetEnvColor(POLY_XLU_DISP++, 255, 0, 0, 255);
+    gSPMatrix(POLY_XLU_DISP++, Matrix_NewMtx(play->state.gfxCtx), G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
+    gSPDisplayList(POLY_XLU_DISP++, object_fwall_DL_000040);
+
+    CLOSE_DISPS(play->state.gfxCtx);
+}
diff --git a/src/overlays/actors/ovl_Bg_Fire_Wall/z_bg_fire_wall.h b/src/overlays/actors/ovl_Bg_Fire_Wall/z_bg_fire_wall.h
index f65fe6e59..018e9f5f1 100644
--- a/src/overlays/actors/ovl_Bg_Fire_Wall/z_bg_fire_wall.h
+++ b/src/overlays/actors/ovl_Bg_Fire_Wall/z_bg_fire_wall.h
@@ -10,7 +10,15 @@ typedef void (*BgFireWallActionFunc)(struct BgFireWall*, PlayState*);
 typedef struct BgFireWall {
     /* 0x000 */ Actor actor;
     /* 0x144 */ BgFireWallActionFunc actionFunc;
-    /* 0x148 */ char unk_148[0x68];
+    /* 0x148 */ s16 texIndex;
+    /* 0x14A */ s16 timer;
+    /* 0x14C */ s16 unk_14C;
+    /* 0x150 */ f32 step;
+    /* 0x154 */ f32 unk_154;
+    /* 0x158 */ f32 unk_158;
+    /* 0x15C */ f32 unk_15C;
+    /* 0x160 */ f32 unk_160;
+    /* 0x164 */ ColliderCylinder collider;
 } BgFireWall; // size = 0x1B0
 
 extern const ActorInit Bg_Fire_Wall_InitVars;
diff --git a/src/overlays/actors/ovl_En_Encount4/z_en_encount4.h b/src/overlays/actors/ovl_En_Encount4/z_en_encount4.h
index 013c907a5..499da9663 100644
--- a/src/overlays/actors/ovl_En_Encount4/z_en_encount4.h
+++ b/src/overlays/actors/ovl_En_Encount4/z_en_encount4.h
@@ -8,12 +8,13 @@ struct EnEncount4;
 typedef void (*EnEncount4ActionFunc)(struct EnEncount4*, PlayState*);
 
 typedef struct EnEncount4 {
-    /* 0x000 */ Actor actor;
-    /* 0x144 */ EnEncount4ActionFunc actionFunc;
-    /* 0x148 */ char unk_148[0x4];
-    /* 0x14C */ s16 unk_14C;
-    /* 0x14E */ s16 unk_14E;
-    /* 0x150 */ char unk_150[0x8];
+    /* 0x0000 */ Actor actor;
+    /* 0x0144 */ EnEncount4ActionFunc actionFunc;
+    /* 0x0148 */ char unk_148[0x4];
+    /* 0x014C */ s16 unk_14C;
+    /* 0x014E */ s16 unk_14E;
+    /* 0x0150 */ s16 unk_150;
+    /* 0x0152 */ char unk_152[0x6];
 } EnEncount4; // size = 0x158
 
 extern const ActorInit En_Encount4_InitVars;
diff --git a/tools/disasm/functions.txt b/tools/disasm/functions.txt
index 0855966fe..935a0b226 100644
--- a/tools/disasm/functions.txt
+++ b/tools/disasm/functions.txt
@@ -8830,7 +8830,7 @@
     0x809AC7F8:("func_809AC7F8",),
     0x809AC970:("func_809AC970",),
     0x809AC9B8:("BgFireWall_Update",),
-    0x809ACB28:("func_809ACB28",),
+    0x809ACB28:("BgFireWall_Draw",),
     0x809ACD90:("EnBu_Init",),
     0x809ACDA8:("EnBu_Destroy",),
     0x809ACDB8:("EnBu_DoNothing",),