How does this passage develop the theme "Evil can never truly hide itself”? Dr. Jekyll tells the men to go away before slamming the window closed. Dr. Jekyll closes the window and makes the men nerv

How does this passage develop the theme "Evil can never truly hide itself”? Dr. Jekyll tells the men to go away before slamming the window closed. Dr. Jekyll closes the window and makes the men nervous by following them home. Utterson and Enfield are horrified when they see Jekyll’s transformation. Utterson and Enfield are ashamed that they did not stay to help Dr. Jekyll.