diff --git a/asm/non_matching/manager1/sub_08057450.inc b/asm/non_matching/manager1/sub_08057450.inc
deleted file mode 100644
index 2ce93081..00000000
--- a/asm/non_matching/manager1/sub_08057450.inc
+++ /dev/null
@@ -1,102 +0,0 @@
-	.syntax unified
-	push {r4, r5, r6, lr}
-	adds r3, r0, #0
-	ldr r4, _08057504 @ =gScreen
-	movs r0, #0x10
-	strh r0, [r4, #0x2e]
-	ldr r0, _08057508 @ =gRoomControls
-	movs r2, #0xc
-	ldrsh r1, [r0, r2]
-	ldrh r0, [r0, #8]
-	subs r1, r1, r0
-	asrs r1, r1, #2
-	movs r2, #0x3f
-	adds r0, r1, #0
-	ands r0, r2
-	strh r0, [r4, #0x30]
-	cmp r1, #0
-	bge _08057474
-	adds r1, #0x3f
-_08057474:
-	asrs r0, r1, #6
-	lsls r0, r0, #9
-	ldr r1, _0805750C @ =gBG3Buffer
-	adds r1, r0, r1
-	str r1, [r4, #0x34]
-	ldr r0, [r3, #0x34]
-	cmp r0, r1
-	beq _0805748A
-	str r1, [r3, #0x34]
-	movs r0, #1
-	strh r0, [r4, #0x32]
-_0805748A:
-	adds r0, r3, #0
-	adds r0, #0x22
-	ldrb r0, [r0]
-	ldr r5, _08057510 @ =gRoomTransition
-	cmp r0, #0
-	bne _080574BE
-	ldr r0, [r5]
-	movs r1, #0x1f
-	ands r0, r1
-	cmp r0, #0
-	bne _080574BE
-	adds r2, r3, #0
-	adds r2, #0x24
-	ldrb r0, [r2]
-	adds r0, #1
-	movs r1, #7
-	ands r0, r1
-	strb r0, [r2]
-	ldr r1, _08057514 @ =gUnk_08107C30
-	ldrb r0, [r2]
-	lsls r0, r0, #1
-	adds r0, r0, r1
-	ldrh r1, [r0]
-	adds r0, r4, #0
-	adds r0, #0x68
-	strh r1, [r0]
-_080574BE:
-	ldr r0, [r5]
-	movs r1, #7
-	ands r0, r1
-	cmp r0, #0
-	bne _08057502
-	adds r0, r3, #0
-	adds r0, #0x23
-	ldrb r1, [r0]
-	lsls r1, r1, #5
-	ldr r2, _08057518 @ =gUnk_085B4180
-	adds r1, r1, r2
-	movs r5, #0
-	adds r6, r0, #0
-	adds r4, r1, #0
-	adds r4, #0xe
-_080574DC:
-	adds r0, r5, #0
-	adds r0, #0x87
-	ldrh r1, [r4]
-	bl SetColor
-	adds r0, r5, #0
-	adds r0, #0x8c
-	ldrh r1, [r4, #0xa]
-	bl SetColor
-	adds r4, #2
-	adds r5, #1
-	cmp r5, #3
-	bls _080574DC
-	ldrb r0, [r6]
-	adds r0, #1
-	movs r1, #3
-	ands r0, r1
-	strb r0, [r6]
-_08057502:
-	pop {r4, r5, r6, pc}
-	.align 2, 0
-_08057504: .4byte gScreen
-_08057508: .4byte gRoomControls
-_0805750C: .4byte gBG3Buffer
-_08057510: .4byte gRoomTransition
-_08057514: .4byte gUnk_08107C30
-_08057518: .4byte gUnk_085B4180
-	.syntax divided
diff --git a/src/manager/manager1.c b/src/manager/manager1.c
index 9701738e..8664caab 100644
--- a/src/manager/manager1.c
+++ b/src/manager/manager1.c
@@ -209,25 +209,15 @@ void sub_080573AC(Entity* this) {
     }
 }
 
-NONMATCH("asm/non_matching/manager1/sub_08057450.inc", void sub_08057450(Entity* this)) {
+void sub_08057450(Entity* this) {
     s32 y;
-    // register s32 temp asm("r2");
-    s32 temp;
-    s32 y2;
     gScreen.bg3.xOffset = 0x10;
     y = gRoomControls.scroll_y;
     y -= gRoomControls.origin_y;
     y >>= 2;
 
-    // Removing temp messes with r1/r2 with regards to y
-    temp = 0x3f;
-    gScreen.bg3.yOffset = y & temp;
-
-    if (y < 0) {
-        y += 0x3f;
-    }
-
-    gScreen.bg3.tilemap = &gBG3Buffer[(y >> 6) << 8];
+    gScreen.bg3.yOffset = y & 0x3f;
+    gScreen.bg3.tilemap = &gBG3Buffer[(y / 0x40) << 8];
     if ((void*)this->z.WORD != gScreen.bg3.tilemap) {
         this->z.WORD = (u32)gScreen.bg3.tilemap;
         gScreen.bg3.updated = 1;
@@ -250,7 +240,6 @@ NONMATCH("asm/non_matching/manager1/sub_08057450.inc", void sub_08057450(Entity*
         ZV(this)[3] = (ZV(this)[3] + 1) & 3;
     }
 }
-END_NONMATCH
 
 const u16 gUnk_08107C1C[] = {
     0x1000, 0xF01, 0xE02, 0xD03, 0xC04, 0xB05, 0xA06, 0x907, 0x908, 0x909,