when is a tourniquet necessary emergency
You should inform him of your actions though, such as when you apply a bandage and/or a tourniquet. It's also important for the person to know that medical help is on the way. Try to make a quick 911 emergency phone call (or ask a bystander) as soon as you are able. In most severe injuries, the use of a bandage and/or tourniquet is merely buying time so that trained medical personnel can take over and do what's necessary.