In the end, Noir gives Nyxia the iron bangle since she needs it more than he does. After following Julian to the door and seeing the worse for wear moogle, Noir is in two minds about handing over a potion. He vaguely remembers some stories that his grandmother told him. They can be useful companions if he remembers correctly. Manpower is also an important resource which they greatly Lack at the moment.
He walks over to the moogle and takes out a potion. "Do not make me regret this." He offers the potion to the moogle. In the end, Noir does not want this moogle to be an unnecessary casualty. If this moogle flees and dies, there is nothing he can do. Noir hopes that this moogle can return the favour and help them.