I've had success saving regular Realplayer streams using the CLI mplayer using the -dumpstream option, however, this does not look like an ordinary stream, since it seems it uses a script to generate user-specific url. If you dig around the source and you know what to look for, you might find a way to get the straight rtsp:// url, but I wouldn't count on it.
You might be better off just using a screen recorder like iShowU.