PR #47500, #47501, #47557, #47588.

code/game/objects/structures/stairs.dm

@@ -2,14 +2,17 @@
 #define STAIR_TERMINATOR_NO 1
 #define STAIR_TERMINATOR_YES 2
 
+// dir determines the direction of travel to go upwards (due to lack of sprites, currently only 1 and 2 make sense)
+// stairs require /turf/open/openspace as the tile above them to work
+// multiple stair objects can be chained together; the Z level transition will happen on the final stair object in the chain
+
 /obj/structure/stairs
 	name = "stairs"
 	icon = 'icons/obj/stairs.dmi'
 	icon_state = "stairs"
 	anchored = TRUE
-	//dir = direction of travel to go upwards
 
-	var/force_open_above = FALSE
+	var/force_open_above = FALSE // replaces the turf above this stair obj with /turf/open/openspace
 	var/terminator_mode = STAIR_TERMINATOR_AUTOMATIC
 	var/turf/listeningTo
 
@@ -108,7 +111,9 @@
 			T.ChangeTurf(/turf/open/openspace)
 
 /obj/structure/stairs/intercept_zImpact(atom/movable/AM, levels = 1)
-	return isTerminator()
+	. = ..()
+	if(isTerminator())
+		. |= FALL_INTERCEPTED | FALL_NO_MESSAGE
 
 /obj/structure/stairs/proc/isTerminator()			//If this is the last stair in a chain and should move mobs up
 	if(terminator_mode != STAIR_TERMINATOR_AUTOMATIC)