Maybe a sufficient fraction of us can be fucking grownups about this. Haru pretends he didn't hear a thing. Maybe a real baseline human wouldn't've.

Before any more snide remarks can be made there's a shriek from the bathroom, followed by the sound of glass breaking, and finally by most of the wooden door and part of the brick wall warping and molding itself into centuar-like figure with an oddly canine face made from porcelain and splotches of human flesh on it's torso among the brick and wood.

It shrieks in a tortured voice, not dissimilar from the previous shriek except far less human. A psychic attack of some sort accompanies the shriek. 

Well, the psychic attack bounces off of him immediately and - he runs away, back toward the ballroom.

One of the other nobles seems to have the same idea, rocketing past him. The remainder are too busy cowering before the demon.

Oh, also, the situation could use some yelling. "DEMON! DEMON IN THE CORRIDOR!"

A man in his 30s is the first on the scene, zooming in trailing a silver light in his path - he doesn't stop to fight the demon, instead opting to rescue one of the cowering victims of the shriek. Several other empowered follow soon after to confront the beast directly.

Haru will continue yelling till he's sure everyone who needs to hear about this has!

"Haru - did it injure you, are you okay?"

"I'm fine for now."

"Did you notice whether the demon manifested itself or entered from outside the building?'

"It came out from the bathroom, I think de-novo, and picked up materials around it - whoever was in there and some of the wall and door - it might have been there before and invisible or small enough to hide without the materials, or might have appeared there just now, I don't know."

"In all likelihood it manifested, I expect. A demon left to grow powerful enough to bear up under the sight of a few people is one thing, but a wild demon in London would be something else entirely."

"Will it go away if enough people look at it simultaneously?"

"Most likely. I can't hear combat anymore, which is promising."

Nod. "- is that the only reason you aren't going to help or is there sexism even about confronting loose demons."

"There is sexism - I might still risk it if there were sufficient danger to innocents. However I believe the Brightlord has already evacuated those who were not involved in the fight."

"The - Brightlord?"

"A noble who earned sufficient distinction in campaigns that his alias was made official. He's also the most decent living individual with this distinction, according to me. He would have left silver light in his wake?"

"Oh, I did see him grab somebody."

Lucette nods.

"He was the first one out of the ballroom... Would you like us to depart now? It would be acceptable to do so given the drama of the evening."

"I haven't danced with Lady Haster yet but perhaps it can be dispensed with."

"I suspect the complicated chain she would have been a part of will no longer function as desired, given how distracted everyone will be by gossiping about this."

"In that case heading out sounds good to me."

There's a line of carriages outside as they don't seem to be the only people with this idea, but eventually, they are on their way.

"Do you require much guiding?" asks Lucette, offering Haru a hand.

"Not a lot, it did some kind of psychic attack but it didn't press it for long or very hard. But some." Handhold.