That the results of this encounter would be quite what one would want... or certainly what was in the video.
I'd say that the Brinks... uhhh Broadview... system would be about as effective in dealing with "The Ex", as say.. oh... a typical restraining order perhaps?
It's called A GUN. Get one. Learn how to use it. Mentally prepare yourself to do so. Refuse to be a victim.
As several people have pointed out in comments (I couldnt find it last night or would have posted it already), "Bethany" has a much better response to the situation: