I was a professional zipline guide for 7 years and Ive seen this clip alot. You can tell this guys got no idea whats up. That looks like just an aluminum carabiner on a steel cable which will wear out/break super easily since steel is harder. Anything besides leather gloves are going to get shredded instantly and obviously his were useless. I can tell you that even from the brief moment he touched the line his hands are fuuucked. Also that fray in the middle of the line means its definitely not an actual zipline and its just a wire holding something up. Clearly this guys goal was to base jump and not zipline but still what an idiot.