A couple of cases that come to mind:
A child is in intensive care. Doctors decide that the child will need blood. JW parents ask the doctor to try non-blood first. Doctors refuse. No sooner than the doctors pump blood, the child dies.
A JW man is in the hospital and the doctor tells him that he needs a blood transfusion or he is going to die. (The man has had the same problem before and doctors give him a ferrous compound IV and he pulls through) Man asks for the ferrous compound and doctors refuse --and go on and on telling the man to take the blood or die. Then the man's loved one comes into the room and doctors kick everybody JW out. Man's loved one is not JW. Doctors tell the loved one to just say the word and the man will get the blood inspite of the blood card. Loved one instructs the doctor to follow the man's wishes. Doctors refuse and meanwhile the man's condition is getting worse. Finally, the doctor agrees to administer the ferrous compound, the man's condition improves to the point where he pulls through and is sent home.