Which of the following skills would you use with a face-down victim of a suspected spinal injury in waist- to chest-deep water?

Using a head splint serves a critical purpose when dealing with a face-down victim who is suspected of having a spinal injury. The head splint technique helps maintain the victim's head and neck in a stable position, minimizing any movement that could exacerbate a potential spinal injury. By securing the head in line with the body, this technique reduces the risk of further injury while also keeping the airway potentially clear.

In waist- to chest-deep water, the head splint allows the rescuer to control the victim's head without needing to flip them over immediately, which is crucial in cases where a spinal injury might be present. This technique often involves the rescuer gently holding the victim's head in place while keeping their own body positioned to provide additional support, all while waiting for professional medical assistance or preparing for further action if needed.

Other techniques, while useful in different situations, either involve movement or positioning that could compromise the integrity of the victim's spine, therefore making the head splint the safest choice for this scenario.