sigh

code/game/atoms.dm

@@ -141,8 +141,18 @@
 
 	return ..()
 
-/atom/proc/handle_ricochet(obj/item/projectile/P)
-	return
+/**
+  * Checks if a projectile should ricochet off of us. Projectiles get final say.
+  * [__DEFINES/projectiles.dm] for return values.
+  */
+/atom/proc/check_projectile_ricochet(obj/item/projectile/P)
+	return (flags_1 & CHECK_RICOCHET_1)? PROJECTILE_RICOCHET_YES : PROJECTILE_RICOCHET_NO
+
+/**
+  * Handle a projectile ricochet. Return TRUE if we did something to the projectile like reflecting it/whatnot.
+  */
+/atom/proc/handle_projectile_ricochet(obj/item/projectile/P)
+	return FALSE
 
 /atom/proc/CanPass(atom/movable/mover, turf/target)
 	return !density

code/game/turfs/simulated/wall/mineral_walls.dm

@@ -191,7 +191,7 @@
 	icon = 'icons/turf/walls/shuttle_wall.dmi'
 	icon_state = "map-shuttle"
 	explosion_block = 3
-	flags_1 = CAN_BE_DIRTY_1 | CHECK_RICOCHET_1
+	flags_1 = CAN_BE_DIRTY_1 | DEFAULT_RICOCHET_1
 	sheet_type = /obj/item/stack/sheet/mineral/titanium
 	smooth = SMOOTH_MORE|SMOOTH_DIAGONAL
 	canSmoothWith = list(/turf/closed/wall/mineral/titanium, /obj/machinery/door/airlock/shuttle, /obj/machinery/door/airlock, /obj/structure/window/shuttle, /obj/structure/shuttle/engine/heater, /obj/structure/falsewall/titanium)
@@ -302,4 +302,4 @@
 
 /turf/closed/wall/mineral/plastitanium/copyTurf(turf/T)
 	. = ..()
-	T.transform = transform
+	T.transform = transform

code/game/turfs/simulated/walls.dm

@@ -41,7 +41,7 @@
 /turf/closed/wall/attack_tk()
 	return
 
-/turf/closed/wall/handle_ricochet(obj/item/projectile/P)			//A huge pile of shitcode!
+/turf/closed/wall/handle_projectile_ricochet(obj/item/projectile/P)			//A huge pile of shitcode!
 	var/turf/p_turf = get_turf(P)
 	var/face_direction = get_dir(src, p_turf)
 	var/face_angle = dir2angle(face_direction)