Cold War warriors should recall that BEADWINDOW was used to notify that protected information had been passed, and was not a term of warning. As I can’t see any EEFIs in this thread, there would appear to be no reason for it to have been called.
Anyway, modern wide-band buffering and voice recognition technology make this fixed code word a security risk in itself... simply listen out for ‘beadwindow’ and rewind a few seconds to find the juicy nugget of information without any need for hours of analysis.