What is the main purpose of tending the prusiks during a lowering operation?

The main purpose of tending the prusiks during a lowering operation is to ensure a smooth and controlled descent. Prusik knots are used as friction devices that can grip the rope, providing a means to control the rate of descent. When tending to the prusiks, the rescuer adjusts the knots to ensure they hold securely while allowing for a gradual and steady lowering process. This attention helps prevent sudden drops or jerky movements, which could lead to accidents or instability in the load being lowered. Proper tending ensures that the system functions effectively, allowing for both the safety of the person being lowered and the rescuer managing the operation.