Growing up can be a bloody business, especially for those of us who menstruate. In her latest horror film, writer-director Jennifer Reeder doesn't shy away from the messier bits of her heroine's coming-of-age journey. In an interview with Mashable, conducted before the SAG/AFTRA strikecommenced, she and leading lady Alicia Silverstone dug into how blood and extreme empathy play into Perpetrator.