Better solution

Repathed the point decal to the temp_visual effects path. This path has
built-in singularity resistance, and allows me to remove a spawn in
favor of a built-in QDEL_IN call

Also changed points from using the magic number 16 to POINT_LAYER for
their layer definition. This does technically drop the point by 4 layers
(POINT_LAYER is 12), placing them now below the light layer (shouldn't
affect anything) instead of just above it.

code/game/objects/effects/decals/misc.dm

@@ -1,15 +1,3 @@
-/obj/effect/decal/point
-	name = "arrow"
-	desc = "It's an arrow hanging in mid-air. There may be a wizard about."
-	icon = 'icons/mob/screen_gen.dmi'
-	icon_state = "arrow"
-	layer = 16.0
-	anchored = 1
-	mouse_opacity = 0
-
-/obj/effect/decal/point/singularity_act()
-	return
-
 // Used for spray that you spray at walls, tables, hydrovats etc
 /obj/effect/decal/spraystill
 	density = 0

code/game/objects/effects/temporary_visuals/miscellaneous.dm

@@ -1,3 +1,12 @@
+/obj/effect/temp_visual/point
+	name = "arrow"
+	desc = "It's an arrow hanging in mid-air. There may be a wizard about."
+	icon = 'icons/mob/screen_gen.dmi'
+	icon_state = "arrow"
+	layer = POINT_LAYER
+	duration = 20
+	randomdir = FALSE
+
 /obj/effect/temp_visual/dir_setting/bloodsplatter
 	icon = 'icons/effects/blood.dmi'
 	duration = 5