Which symptom would require immediate evacuation in an abdominal injury?

Blood in feces is a significant and potentially serious symptom that may indicate internal bleeding or damage to the gastrointestinal tract as a result of an abdominal injury. This condition can lead to a decrease in blood volume and potentially shock, which can be life-threatening. Given the possibility of severe complications such as organ perforation or significant internal hemorrhage, immediate evacuation is warranted to ensure the injured person receives advanced medical care.

While nausea and diarrhea can accompany many abdominal injuries and may warrant attention, they do not usually indicate an immediate life-threatening situation. Fatigue can be a result of various factors, but it is not a specific indicator of a severe condition that necessitates urgent evacuation. Therefore, blood in feces stands out as the most critical symptom demanding immediate medical intervention.