It was mandatory for the werewolves to transform on every full moon night. In the initial days after the curse, they would transform as soon as their eyes would meet the full moon or when the moonlight would fall onto their skin. It was an inevitable phenomenon for them and none of them how to control it. But as the generations passed, they were able to resist their transformation for a limited time, any more than that and they would be dead.
Because of the control on the transformation, the werewolves were able to maintain themselves by gathering in a secluded area for the transformation, so they would not harm any innocents.
