LOS casting changed with many patches during classic and velious so people can actually recall classic casting rules that differ based.
I remember spells requireing no LoS start or end, I remember spells only requring start LoS and also briefly spells requring start and end.
Also Dispell was considered beneficial spell for a very long time and could dispell through walls. Also remember dispelling people with mobs and getting aggro from the beneficial aspect of dispell
Also some zones were very buggy and walls didnt act like walls. High keep was notorious for this
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