Found it by accident when playing Clash last week. If you angle yourself just right (or adjust in midair), you can bounce back and forth between the "mainland" and "island" launchers on the Crossroads map. In my case, I was using my hunter and "jumping" a bit to the side right before arriving at the launcher on the landing side. I've never seen anyone else do this. If you have, I'm just curious how many "bounces" you were able to do.