"The bracelet having the tether to a person - rather than a place - was strange. It took me ages to figure it out, but the modifications are based on the same theory that binds those with the Mark to Voldemort. The potion is designed to break down the link with the master of the connection. My theory, my hope, is that if it works on the tether, then I can get the Mark off Draco before it kills him."