[youtube http://www.youtube.com/watch?v=gzOzNtvpEIw&w=560&h=315] Gliders Dogfighting Over Utah Mountains by Bruno Vassel Five high performance gliders got together over 2013 Memorial Day and flew around the Utah mountains near Nephi and Provo chasing each other. This video shows some of the casual formation flying near the rocks. Filmed with a…