OSRS bug question

does anyone know of a bug that allows you to kill npcs without them hitting back. sort of like the wildy boss safespots, but specifically for revenants. someone i know is gonna pay alot of money for this info, but its very sketchy. the guy did safespot every rev, but i think hes bug abusing becasue he said he had to go on the account personally for it to work.

 

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