hardrefs to weakrefs

code/datums/ammo/bullet/sniper.dm

@@ -114,7 +114,7 @@
 
 		if(istype(aimed_projectile.shot_from, /obj/item/weapon/gun/rifle/sniper/XM43E1))
 			var/obj/item/weapon/gun/rifle/sniper/XM43E1/amr = aimed_projectile.shot_from
-			if(target_mob == amr.focused_fire_target)
+			if(target_mob == (amr.focused_fire_target?.resolve()))
 				if(amr.focused_fire_counter < 2)
 					amr.focused_fire_counter += 1
 				else
@@ -123,7 +123,7 @@
 				amr.focused_fire_counter = 0
 
 			amr_counter = amr.focused_fire_counter + 1
-			amr.focused_fire_target = target_mob
+			amr.focused_fire_target = WEAKREF(target_mob)
 
 		var/mob/living/living_target = target_mob
 		var/size_damage_mod = 0.8 // 1.8x vs Non-Xenos (225)

code/datums/elements/bullet_trait/damage_boost.dm

@@ -78,7 +78,7 @@ GLOBAL_LIST_INIT(damage_boost_vehicles, typecacheof(/obj/vehicle/multitile))
 			active_damage_mult = damage_mult
 
 
-	if(boosted_projectile.damage_boosted && (boosted_projectile.last_atom_signaled != hit_atom) && (!boosted_projectile.bonus_projectile_check))
+	if(boosted_projectile.damage_boosted && ((boosted_projectile.last_atom_signaled?.resolve()) != hit_atom) && (!boosted_projectile.bonus_projectile_check))
 	//If this is after a boosted hit, the last atom that procced this isn't the same as the current target, and this isn't a bonus projectile sharing the same damage_boost
 		if(!boosted_projectile.last_damage_mult) //Make sure stored mult isn't 0
 			boosted_projectile.last_damage_mult = 1
@@ -95,4 +95,4 @@ GLOBAL_LIST_INIT(damage_boost_vehicles, typecacheof(/obj/vehicle/multitile))
 			boosted_projectile.last_damage_mult = 1
 
 		boosted_projectile.damage_boosted++ //Mark that a boosted hit occurred.
-		boosted_projectile.last_atom_signaled = hit_atom //Save the current triggering atom to the projectile
+		boosted_projectile.last_atom_signaled = WEAKREF(hit_atom) //Save the current triggering atom to the projectile

code/modules/projectiles/guns/specialist/sniper.dm

@@ -347,7 +347,7 @@
 	indestructible = 1
 	aimed_shot_cooldown_delay = 4 SECONDS
 	var/focused_fire_counter = 0
-	var/mob/focused_fire_target = null
+	var/datum/weakref/focused_fire_target = null
 
 	fire_sound = 'sound/weapons/sniper_heavy.ogg'
 	current_mag = /obj/item/ammo_magazine/sniper/anti_materiel //Renamed from anti-tank to align with new identity/description. Other references have been changed as well. -Kaga

code/modules/projectiles/projectile.dm

@@ -84,7 +84,7 @@
 	var/bonus_projectile_check = 0
 
 	/// What atom did this last receive a registered signal from? Used by damage_boost.dm
-	var/atom/last_atom_signaled = null
+	var/datum/weakref/last_atom_signaled = null
 
 	/// Was this projectile affected by damage_boost.dm? If so, what was the last modifier?
 	var/damage_boosted = 0