But the pain would not leave and damn this restraint, it would not leave him, either. From the moment Hermione had abandoned him he had raged against the Vow, raged against the magic that held him. It never wavered, not even once. The barrier inside of him that blocked his magic from his access was impenetrable. Draco used every last reserve of his strength, every minute bit of his focus to blast it apart, to undo the curse, but it never faltered for even a second, and he was still stuck here with his magic severely limited.  