diff --git a/asm/field_map_obj.s b/asm/field_map_obj.s
index e772aa178a..2c94181653 100755
--- a/asm/field_map_obj.s
+++ b/asm/field_map_obj.s
@@ -5,108 +5,6 @@
 
 	.text
 
-	thumb_func_start npc_block_way
-@ u8 npc_block_way(struct npc_state *fieldObject, u16 x, u16 y, u8 direction)
-npc_block_way: @ 8092BC8
-	push {r4-r7,lr}
-	mov r7, r10
-	mov r6, r9
-	mov r5, r8
-	push {r5-r7}
-	adds r6, r0, 0
-	lsls r1, 16
-	lsls r2, 16
-	lsls r3, 24
-	lsrs r7, r3, 24
-	mov r8, r7
-	lsrs r0, r1, 16
-	mov r9, r0
-	asrs r5, r1, 16
-	lsrs r0, r2, 16
-	mov r10, r0
-	asrs r4, r2, 16
-	adds r0, r6, 0
-	adds r1, r5, 0
-	adds r2, r4, 0
-	bl IsCoordOutsideFieldObjectMovementRect
-	lsls r0, 24
-	cmp r0, 0
-	beq _08092BFE
-	movs r0, 0x1
-	b _08092C7E
-_08092BFE:
-	adds r0, r5, 0
-	adds r1, r4, 0
-	bl MapGridIsImpassableAt
-	lsls r0, 24
-	cmp r0, 0
-	bne _08092C40
-	adds r0, r5, 0
-	adds r1, r4, 0
-	bl GetMapBorderIdAt
-	movs r1, 0x1
-	negs r1, r1
-	cmp r0, r1
-	beq _08092C40
-	adds r0, r6, 0
-	adds r1, r5, 0
-	adds r2, r4, 0
-	adds r3, r7, 0
-	bl IsMetatileDirectionallyImpassable
-	lsls r0, 24
-	cmp r0, 0
-	bne _08092C40
-	ldrb r0, [r6, 0x1]
-	lsrs r0, 7
-	cmp r0, 0
-	beq _08092C44
-	mov r0, r8
-	bl CanCameraMoveInDirection
-	cmp r0, 0
-	bne _08092C44
-_08092C40:
-	movs r0, 0x2
-	b _08092C7E
-_08092C44:
-	ldrb r0, [r6, 0xB]
-	lsls r0, 28
-	lsrs r0, 28
-	mov r2, r9
-	lsls r1, r2, 16
-	asrs r5, r1, 16
-	mov r2, r10
-	lsls r1, r2, 16
-	asrs r4, r1, 16
-	adds r1, r5, 0
-	adds r2, r4, 0
-	bl IsZCoordMismatchAt
-	lsls r0, 24
-	cmp r0, 0
-	beq _08092C68
-	movs r0, 0x3
-	b _08092C7E
-_08092C68:
-	adds r0, r6, 0
-	adds r1, r5, 0
-	adds r2, r4, 0
-	bl CheckForCollisionBetweenFieldObjects
-	lsls r0, 24
-	cmp r0, 0
-	bne _08092C7C
-	movs r0, 0
-	b _08092C7E
-_08092C7C:
-	movs r0, 0x4
-_08092C7E:
-	pop {r3-r5}
-	mov r8, r3
-	mov r9, r4
-	mov r10, r5
-	pop {r4-r7}
-	pop {r1}
-	bx r1
-	thumb_func_end npc_block_way
-
 	thumb_func_start sub_8092C8C
 sub_8092C8C: @ 8092C8C
 	push {r4-r7,lr}
diff --git a/include/field_ground_effect.h b/include/field_ground_effect.h
index e2dc3a00fc..398265b87a 100644
--- a/include/field_ground_effect.h
+++ b/include/field_ground_effect.h
@@ -12,5 +12,6 @@
 // Exported ROM declarations
 void SetObjectSubpriorityByZCoord(u8, struct Sprite *, u8);
 void InitObjectPriorityByZCoord(struct Sprite *, u8);
+bool8 IsZCoordMismatchAt(u8, s16, s16);
 
 #endif //GUARD_FIELD_GROUND_EFFECT_H
diff --git a/include/fieldmap.h b/include/fieldmap.h
index 511c1061f9..7174d98ccc 100644
--- a/include/fieldmap.h
+++ b/include/fieldmap.h
@@ -12,5 +12,8 @@
 // Exported ROM declarations
 u8 MapGridGetMetatileBehaviorAt(s16, s16);
 void GetCameraCoords(u16*, u16*);
+bool8 MapGridIsImpassableAt(s16, s16);
+s32 GetMapBorderIdAt(s16, s16);
+bool32 CanCameraMoveInDirection(u8);
 
 #endif //GUARD_FIELDMAP_H
diff --git a/src/field_map_obj.c b/src/field_map_obj.c
index 93baccf367..5ec5e68f49 100755
--- a/src/field_map_obj.c
+++ b/src/field_map_obj.c
@@ -121,6 +121,10 @@ void DoGroundEffects_OnFinishStep(struct MapObject *, struct Sprite *);
 void npc_obj_transfer_image_anim_pause_flag(struct MapObject *, struct Sprite *);
 void FieldObjectUpdateSubpriority(struct MapObject *, struct Sprite *);
 
+bool8 IsCoordOutsideFieldObjectMovementRect(struct MapObject *fieldObject, s16 x, s16 y);
+bool8 IsMetatileDirectionallyImpassable(struct MapObject *, s16, s16, u8);
+bool8 CheckForCollisionBetweenFieldObjects(struct MapObject *, s16, s16);
+
 // ROM data
 
 void (*const gUnknown_08505438[NUM_FIELD_MAP_OBJECT_TEMPLATES])(struct Sprite *);
@@ -3637,7 +3641,7 @@ void npc_set_running_behaviour_etc(struct MapObject *mapObject, u8 animPattern)
 
 dirn2anim(npc_running_behaviour_by_direction, gUnknown_0850DB53)
 
-bool8 npc_block_way__next_tile(struct MapObject *mapObject, u8 direction)
+u8 npc_block_way__next_tile(struct MapObject *mapObject, u8 direction)
 {
     s16 x;
     s16 y;
@@ -3648,6 +3652,24 @@ bool8 npc_block_way__next_tile(struct MapObject *mapObject, u8 direction)
     return npc_block_way(mapObject, x, y, direction);
 }
 
+u8 npc_block_way(struct MapObject *mapObject, s16 x, s16 y, u32 dirn)
+{
+    u8 direction;
+
+    direction = dirn;
+    if (IsCoordOutsideFieldObjectMovementRect(mapObject, x, y))
+        return 1;
+    else if (MapGridIsImpassableAt(x, y) || GetMapBorderIdAt(x, y) == -1 || IsMetatileDirectionallyImpassable(mapObject, x, y, direction))
+        return 2;
+    else if (mapObject->mapobj_bit_15 && !CanCameraMoveInDirection(direction))
+        return 2;
+    else if (IsZCoordMismatchAt(mapObject->mapobj_unk_0B_0, x, y))
+        return 3;
+    else if (CheckForCollisionBetweenFieldObjects(mapObject, x, y))
+        return 4;
+    return 0;
+}
+
 asm(".section .text.get_face_direction_anim_id");
 
 void FieldObjectClearAnimIfSpecialAnimActive(struct MapObject *);