What command did you run above to make it show the help instructions? Use the same command there. It’s hard to tell whats going on in your terminal, but do not type any special characters in front of the word “butler”, (no $, %, etc.)
When you typed $butler login you actually ran your shell’s login command, because you mentioned a shell variable named $butler before the command that evaluated to an empty string and had no effect. The prompt you saw was not from the butler command.