Evelyn is the Empress and is left in charge of handling the city matters.
She knew that the heart of the people took her side but it was clear that in a confrontational situation, the people were still doubtful of her competence. She couldn't exude the same air, as the Emperor that could calm their nerves.
It was clearly seen from the faces of the city guards around.
Considering the Angel's threat, this should be nothing for the grand scale of Dargena City.
So seeing them scared and nervous was a sign of her incompetence in this area.
Due to that, she needs to be strong and composed in this situation.
"... you will not see the next minute"
Upon hearing the threat that came out of Evelyn's lips, the possessed Giana tilted her head, checking to see if Evelyn was making a bluff or not. But from a swift inspection alone, it was clear that she was bluffing.
Or at least, the Angel believed that she was bluffing.