Incorrect, it's both. It's basic physics if it have mass and velocity it has energy. The mass near the end of the rope is more important in an impact hence the loop on the rope and soft shackle are the most damage causing parts.The soft shackle isn't what caused the damage to the windshield, it was the kinetic rope. The rope has a lot of energy and weight, the shackle was just along for the ride.
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