Which of the following techniques can offset the weight of the load on an anchor?

Implementing back tying is an effective technique for offsetting the weight of a load on an anchor. This method involves attaching a secondary rope or harness to the anchor, which allows for a redistribution of weight. By doing so, it enhances the stability of the setup and reduces the strain on the primary anchor point, ensuring that the load is better managed throughout the rescue operation.

This technique is particularly valuable during rescue scenarios, as it helps to provide additional safety and security for the rescuers and the person being rescued. It mitigates potential risks associated with shifting loads or the anchor becoming overloaded, which is crucial when operating in dynamic environments.

In contrast, the other techniques listed have different applications. For example, a figure 8 descender is primarily used for controlled descents and does not contribute directly to offsetting load on an anchor. Similarly, a two-point anchor can provide stability but does not inherently adjust for weight offset unless designed specifically to do so. Employing a locking off method is beneficial for securing a line but does not directly address the issue of load distribution on an anchor.