This chapter retcons the fact the it was originally an intentional decision by Lilia to throw Nishina. Also given the blood I'm assuming that Nishina is dead in the past/real world.
Didn't expect her to masturbate in public like that. Thinking back, it's actually in character with how horny she is. No one can see, best place ever!
Unfortunately the goddess was watching and thought: WTF is she doing?