53 Flashback: An Angelic Reunion
The battle had been over long ago. Angels and Demons alike were able to visit the earth and live among humans. There was still a divide between the Angels who fought to seal the opening and those who wanted there to be freedom. Those angels were cast out and became known as the fallen ones.
There was a time when Michael and Lucifer worked side by side, and they also formed a close bond and cherished one another. Michael was shocked and felt betrayed when Lucifer chose the opposing side. Lucifer felt strongly that Angels shouldn't only observe unless called upon for duty. He believed that Angels deserved freedom and were not under the Deities' control.