These chains connect the collars of both warriors.When you open the door,and drag you straight into the room at once...Guh... this collar isn't budging an inch!it's set up to throw chains at you,forcefully attach a collar around your neck,I've done it now....Even a vampire like you wouldn't be strong enough to break it off. These things were made to be tough.The rules say that the one who wins the duel is the one that gets to unlock the collar and become free.