At what height should a stopper knot be placed in the descent line?

A stopper knot should be placed in the descent line at the height where the user can make contact with the ground with their feet to ensure safety during the descent. This placement allows the user to reach the ground securely and confidently, preventing potential accidents that could occur from an unexpected fall or a line that is positioned too high. When the stopper knot is positioned correctly, it provides a clear indication of when the user is nearing the ground, which is crucial for maintaining control during the descent and for facilitating a safe landing.

Placing the knot at the bottom of the descent line would not offer any indication of when the user is approaching the ground, increasing the risk of falling too hard or overshooting the landing area. A middle placement could also be ineffective, as it would not correspond to the user's feet contacting the ground. Similarly, claiming that no knot is needed overlooks the importance of safety precautions, as the stopper knot is a critical element in ensuring the user can descend safely. Overall, the correct answer underscores the importance of situational awareness and safety protocols in descent practices.