When assisting a person with life-threatening bleeding, which method should you avoid?

Leaving the wound exposed is not advisable when assisting a person with life-threatening bleeding because it can lead to further complications, such as increased exposure to contaminants and the potential for additional bleeding. Keeping the wound covered and applying pressure is crucial in managing severe bleeding. Covering the wound helps to protect it from infection and assists in controlling blood loss, which is vital for the victim's survival until professional medical help arrives.

The other methods, such as applying direct pressure, calling for help, and using a tourniquet when necessary, are essential actions that can significantly assist a person experiencing severe bleeding. They contribute actively to staunching the blood flow, thereby increasing the chances of survival and stabilization.