When you take the cure, your blood becomes it. When someone drinks your blood to the point of your death, they get the cure and you die. How is Katherine still alive if Silas drank all her blood for the cure? Same for Silas. Amara drained him but he just got up and walked to a bus stop.
Does this mean that you DON'T drink all of the targets' blood (cure) in order to get it? I'm fairly certain I heard you had you to be drained dry.
Any experts care to help me solve this question?