What must a rescuer control during a rappel pick off?

During a rappel pick-off, the rescuer must focus on controlling both the descent and the subject's weight to ensure a safe and effective operation. Descent control is crucial because it allows the rescuer to manage how quickly or slowly they and the subject descend, minimizing the risk of injury from a sudden drop. Additionally, managing the subject's weight is important because it influences the dynamics of the rappel system. The combined weight of the rescuer and the subject can affect the tension and the ability to brake or stop the descent effectively.

Controlling these factors ensures that the rescuer can safely navigate the descent while also maintaining the stability needed to protect both themselves and the individual they are assisting. This control is vital to avoid accidents that could occur if either factor is not adequately managed during the operation.