Adds helpers to avoid << use

code/modules/spells/spell_types/knock.dm

@@ -13,7 +13,7 @@
 	action_icon_state = "knock"
 
 /obj/effect/proc_holder/spell/aoe_turf/knock/cast(list/targets,mob/user = usr)
-	user << sound('sound/magic/knock.ogg')
+	SEND_SOUND(user, sound('sound/magic/knock.ogg'))
 	for(var/turf/T in targets)
 		for(var/obj/machinery/door/door in T.contents)
 			INVOKE_ASYNC(src, .proc/open_door, door)

code/modules/spells/spell_types/mind_transfer.dm

@@ -75,5 +75,5 @@ Also, you never added distance checking after target is selected. I've went ahea
 	//Here we knock both mobs out for a time.
 	caster.Unconscious(unconscious_amount_caster)
 	victim.Unconscious(unconscious_amount_victim)
-	caster << sound('sound/magic/mandswap.ogg')
-	victim << sound('sound/magic/mandswap.ogg')// only the caster and victim hear the sounds, that way no one knows for sure if the swap happened
+	SEND_SOUND(caster, sound('sound/magic/mandswap.ogg'))
+	SEND_SOUND(victim, sound('sound/magic/mandswap.ogg'))// only the caster and victim hear the sounds, that way no one knows for sure if the swap happened