content: When you ACTUALLY zipline, not whatever this moron was doing, there's this whole... I don't know what it's called, but it kind of looks like a big pulley system with wheels on it that DO have a breaking system.    This guy said screw it and just went with that stupid little holding clip thing - as if he were climbing, rather than ziplining.    That stuff on the line looked like it was some kind of connection for the two segments of the line, which may also be a safety thing - again, I don't know the words for these things.    Edit: Here we go! this thing: https://www.zipline.systems/index.php/zip-line-pulleys-trolleys.html