For the record, all games of chicken are dumb.
This is a clear case of somebody being where they weren't supposed to be. It was either the camerawoman and her friend on the ATV, or the pilot. I'm guessing it wasn't the pilot, because takeoffs and landings are tightly regulated even for old-timey biplanes. Also, nobody has ever obeyed the rules on an ATV.
You can hear the real terror in her voice as the plane flies by, but the second after, she sounds exhilarated. This makes me worry that she's going to try it again. Is no stunt pilot safe?