When I was taking a music appreciation class, I listened to Mozart's The Magic Flute, and when I saw the Queen of the Night fighting with Sarastro, my mind was opened.
The setting is that the Queen of the Night kept giving Salas the good guy card, and Salas couldn't stand it, so he indirectly killed the Queen of the Night's lover, so later the Queen of the Night hated Salas so much that she asked her daughter to assassinate him.
Of course, the above is all just imagination.
Sauce
Intention: