Hi,
the image is not so clear, but I guess the loop is due the destination URL matches the source URL. In your case this is because you want to drop part of path.
To avoid this, just use "regexp" features like ^ (means "start with") and $ (means "end with").
Just an example. Suppose you want to redirect
www.domain.com/page.html to the real full path
www.domain.com/folder/page.html. In this case, you can configure item as follow:
FromURL: ^/page.html
ToURL: http://{siteurl}/folder/page.html
In this case the destination REQUEST_URI (used by ReDJ) will be "/folder/page.html", and this doesn't match anymore with "^/page.html" because don't start with "/page.html" (there's the "/folder" part).
I hope I was clear.
Let me know,
Luigi