What an eventful episode. And Aguirre-Sacasa wasn't kidding when he said this season would go darker than the first one.
I dunno, "sheep" emphasises more on stupidity and blindness than innocence, making the wolf that finishes off more of a good guy.
I don't know why Polly headed to the farm. It's not like Miss Grundy was safe even outside of Riverdale. At least if she stayed at home she would have been protected by family and friends.