I have been thinking about the red shoe thing. A lot of people have posted theories that it's probably symbolic of basically "dancing with the devil". But what if the red shoes are more of a practical thing? In medicine nurses and doctors wear white shoes so if they get blood on them it's visible and they can clean it off. What if these people wear red shoes in the kill room so if they get blood on their shoes it's less detecable, also maybe a dog whistle to other murderers that they are into human sacrifice or blood play?