What is the purpose of a throw bag in surface water rescues?

In surface water rescues, the primary purpose of a throw bag is to provide a means of reaching a victim by throwing a line for them to grab onto. The throw bag contains a length of rope that can be easily and accurately tossed to a person in distress without the rescuer needing to enter the water. This method allows the rescuer to maintain safety and distance from the hazardous conditions while still providing a means of support to the victim. The victim can grasp the rope and be pulled to safety, or it can serve as a lifeline for them to secure themselves until assistance arrives.

The other options mentioned, while they may relate to broader rescue techniques, do not capture the specific function of the throw bag in this context. For instance, creating a barrier against currents, carrying additional supplies, or signaling for help are not the primary functions of a throw bag in surface water rescues. The focus remains on enabling the rescuer to safely reach and assist the victim.