 You know, I made Tali not know the rules of the slasher genre such that I could then walk him and the reader through the conventions, through the tropes, through the formula, through the whole genre. So if Tali were an expert from the get-go, he would know immediately what's happening to him, and that would kind of kill that initial expositional arc where he has to figure out his own powers and figure out the story he's in.