rot13-other-window too horny

[Dan Jacobson]

Emacs> rot13-other-window is an interactive compiled Lisp function in `rot13'.
Emacs> (rot13-other-window)
Emacs> 
Emacs> Display current buffer in rot 13 in another window.
Emacs> To terminate the rot13 display, delete that window.

why the line
Emacs> (rot13-other-window)
in this help message, and why, pray tell, when I do
$ emacs file1 file2
ESC x rot13-other-window RET C-x o C-x b RET
one can see that rot13 has also contaminated the Buffer-list and even
the other innocent file of the command line.  Quite clearly beyond the
mere claim that it will just "Display current buffer in rot 13 in
another window."
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