I landed a job with Roger Corman. The job was to write the English dialogue for a Russian science fiction picture. I didn't speak any Russian. He didn't care whether I could understand what they were saying he wanted me to make up dialogue.
Nearly all monster stories depend for their success on Jack killing the Giant Beowulf or St. George slaying the Dragon Harry Potter triumphing over the basilisk. That is their inner grammar and the whole shape of the story leads towards it.