What is advisable to use when constructing a tandem prusik belay in case the tandem prusiks get stuck?

Using a load-releasing hitch when constructing a tandem prusik belay is advisable primarily because of its capability to effectively manage and relieve the load in situations where the prusiks may become stuck. A load-releasing hitch allows rescuers to create a secure knot that can bear weight but can also be released under load, thus avoiding the potential mishaps of getting tangled or locked in place during a rescue operation.

In scenarios where the tandem prusiks are under heavy load or have become jammed due to movement or sudden shifts in weight, the load-releasing hitch provides a safe method to lower or release the load without requiring direct access to the stuck prusiks. This ensures the safety of both the victim and the rescuer, allowing for a controlled descent or adjustment.

The other available options, while useful in various contexts, do not provide the same level of operational flexibility and safety specifically needed for a tandem prusik configuration. A quick-release mechanism may not be suitable for all rescue loading conditions, and an emergency strap does not directly address the need for release under strain. A backup prusik, although essential as an additional safety measure, does not provide a means to release the load if the primary prusiks become impeded.