To prevent the prophecy, that will dissolve everyone in Fontaine, Furina has to act as the Hydro Archon. She has been suffering though 500 years alone and needs to keep the fact, that she's a cursed human, a secret.
After another day of fulfilling the same dutie, she decided to take some time to herself. So, with the night as her cover and no one around, she started dancing through the empty streets of the city. The moonlight seems like spot lights of a stage, representing her always ongoing performance.
At the thought of her whole act Furina breaks down. She falls on her knees, while tears started welling up in her eyes and streaming down her cheeks. When noticing someone's presence she peaks up.
"W-who is there?!" she asked while frantically looking around