Final answer:
The appropriate response when a casualty has an impalement is to not remove the impaled object and to keep the casualty still while waiting for emergency medical services.
Step-by-step explanation:
When a casualty has an impalement, the appropriate response is to not remove the impaled object. Removing the object can cause further damage and increase bleeding. The casualty should be kept as still as possible and emergency medical services should be called immediately. While waiting for help, the impaled object can be stabilized with bulky dressings or other materials, surrounding it to prevent movement.