Replace all secondary flags with bitflags stored in the flags_2 var

code/game/objects/items/weapons/grenades/plastic.dm

@@ -4,6 +4,7 @@
 	icon_state = "plastic-explosive0"
 	item_state = "plastic-explosive"
 	flags = NOBLUDGEON
+	flags_2 = NO_EMP_WIRES_2
 	det_time = 10
 	display_timer = 0
 	var/atom/target = null
@@ -18,10 +19,6 @@
 	plastic_overlay = mutable_appearance(icon, "[item_state]2")
 	..()
 
-/obj/item/weapon/grenade/plastic/Initialize(mapload)
-	. = ..()
-	SET_SECONDARY_FLAG(src, NO_EMP_WIRES)
-
 /obj/item/weapon/grenade/plastic/Destroy()
 	qdel(nadeassembly)
 	nadeassembly = null

code/game/objects/items/weapons/holy_weapons.dm

@@ -372,10 +372,10 @@
 	slot_flags = null
 	hitsound = 'sound/weapons/bladeslice.ogg'
 	attack_verb = list("attacked", "slashed", "stabbed", "sliced", "torn", "ripped", "diced", "cut")
+	flags_2 = SLOWS_WHILE_IN_HAND_2
 
 /obj/item/weapon/nullrod/tribal_knife/Initialize(mapload)
 	..()
-	SET_SECONDARY_FLAG(src, SLOWS_WHILE_IN_HAND)
 
 /obj/item/weapon/nullrod/tribal_knife/New()
 	..()