Remus snarled the moment he saw the decree. This was bull shit. Complete and utter bull shit. Registering Dark Creatures? Remus was so mad he could scream. Instead, though, as he received the owl at the school, he was unable to respond how he truly wanted to.
Even incinerating the piece of parchment did absolutely nothing towards lessening his anger.
Still -- while he may have balked at the other decrees, as much as he hated this one, Remus knew he couldn't stay away. He knew he'd have to register himself. If he didn't, he'd surely lose his position at Hogwarts. If he did, there was only a chance he'd lose his position.