[@ERode]
I don't think Oz left House Falloch on bad terms. He didn't metaphorically leave the house as in he disowned himself, he just physically left to get his own place and do research outside of Falloch's libraries. So I don't think they'd have a contract open on him. 

However, I feel like as Oz transitioned into the adult mage world, he probably found out that he likes both Obscurity and Precedence crested because one is associated with secrets and mysteries and hidden truths while the other is about absolute truths and rules and authority. Oz is trying to learn all the secrets, all the rules, and all forms of truth because he wants to define what the universe is. They probably hate him though. He brings hidden things into the light and tries to bend rules to see what breaks. 

I feel like once he does meet Amaya and Reina he's going to have to mediate between the two to keep them from killing each other. He's a small man stepping into a large world and has no clue the kind of history these two would have experienced.