What factor is critical when choosing an anchor point for a rope rescue?

The stability and strength of the anchor point is critical when choosing an anchor for a rope rescue because it ensures the anchor can handle the dynamic forces exerted during the rescue operation. An anchor must be capable of supporting not just the weight of the rescuer, but also any additional forces that may occur as a result of movements, such as a victim being lifted or lowered. If an anchor is unstable or weak, it can lead to failure, jeopardizing the safety of both the rescuer and the victim. Thus, selecting a reliable anchor point that is secure and has sufficient strength is paramount to the success and safety of the rescue operation.