Final answer:
Assessing neurological function helps determine injury extent and prioritize interventions. Immobilizing the head and neck is the first nursing intervention in this case.
Step-by-step explanation:
A rapid assessment of neurological function is important in an emergency situation because it helps determine the extent of the patient's injury and enables healthcare providers to prioritize interventions. The initial assessment involves checking the patient's level of consciousness, orientation, and responsiveness. In this case, the first nursing intervention should be to immobilize the client's head and neck to prevent further damage or potential spinal cord injury.