Serious bleeding is a terrifying sight. If it takes a long time and the victim loses a lot of blood, can lead to shock, sometimes leading to death. (This is something other than emotional shock, caused by such bad news).
The victim is located in the shock has a pale face and cold, clammy and sweaty skin. Breathes rapidly, has a rapid pulse. It is very important to give him warmth and without delay to look to professional medical assistance.