I went back and re-read that section with the armband and I don't know why I thought it created a bond between the two of them. 🤦🏻♂️ I don't know where I came up with that haha!
it is a binding ring, i can see how you confused the concept. but yeah, personally i'm still worried that it may come to play a moment Asterion will have to go to the valley not by the master's will and the contract would still server his arm. i wanted to contest the terms of it but you are railroaded to do that contract as is.