The care of causalities is not just physical injuries
The first thing we often think about is the physical injuries the patient may have, however there may be emotional support to prevent the deteritation of mental health. This can be as simple as screening traumatic injuries around them.
Casualties are witnesses to the incident - they may need follow up support too!
After the incident these casualties may be recovering from injuries (often life changing), therefore their recovery should contain mental health support too. They may also know other survivors or fatalities from the incident.