Satan is depicted as having social issues in this strip so constantly having new people show up is torturous for him.

he hates answering the door for strangers

⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⢀⣶⣿⣿⣿⣿⣿⣿⣶⣆⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄ ⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⣸⣿⣿⠉⠉⠉⠄⠉⢹⣿⣦⡀⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄ ⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⢿⣿⣿⣁⠄⠄⠤⠤⡀⠻⣿⠃⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄ ⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠘⣿⣿⣿⡗⠖⡶⢾⣶⠊⡏⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄ ⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⢻⣿⣿⣅⣈⠂⠐⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄ ⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠘⢿⣾⣇⣂⣠⠄⠄⠄⠁⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄ ⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⢘⣿⣗⠒⠄⢨⠶⢁⣄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄ ⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠨⣿⣿⡿⠋⠁⣴⣿⣿⣷⣦⣄⡀⠄⠄⠄⠄⠄⠄⠄⠄ ⠄⠄⠄⠄⠄⠄⠄⠄⠄⢀⣠⣄⣶⣎⢱⢄⢀⣾⣿⣿⣿⣿⣿⣿⣿⣶⣦⣤⣄⠄⠄⠄⠄ ⠄⠄⠄⠄⠄⠄⠄⢠⣾⣿⣿⡞⢝⡟⠃⣠⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣯⣿⣿⣇⠄⠄⠄ ⠄⠄⠄⠄⠆⢄⠄⢛⡫⠝⢿⡥⠟⡃⣴⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣼⣭⣻⣿⣿⡀⠄⠄ ⠄⠄⠄⣴⣆⠄⢋⠄⠐⣡⣿⣆⣴⣼⣿⣿⣿⣿⣿⣿⣿⣿⠏⢈⣿⣿⣿⣿⣿⣿⣷⡄⠄ ⠄⠄⣼⣿⣷⠄⠉⠒⣪⣹⣟⣹⣿⣿⣿⣿⣿⣟⣿⣿⣿⡇⢀⣸⣿⣿⣿⢟⣽⣿⣿⣇⠄