"Of course the heartlands are protected by our lords, but the Valley of <???> is distant from the core, and new. It is my family's endeavor, to harvest certain materials from the valley, which can have wholesome uses. But our distance and independence comes at the price of danger- From the wilds, more than from demonic practitioners, usually. Such is the way the world works. More support to secure this area may be possible, or it might be best to abandon it. There are many places where strong practitioners are needed, and of course, not all are motivated by Karma. I will have to discuss the matter with Her bureaucracy. But this place leaves bitterness in me now."

"I see. I wish you good luck in that, then."

She considers offering to stay for a while to shore up their defences while they see if they can make arrangements for defense, but she doesn't know how long that will take, she doesn't know if this town has enough to hold her interest for weeks to months, and while she isn't in a hurry, she doesn't exactly consider herself not in a hurry either. She can always make the offer later if she wants, and it doesn't sound like they expect her to. It's not as if everyone here is going to die; they'll scatter to find their fortunes elsewhere, it sounds like.

If the fox girl is invested in the town continuing as a political entity (she's clearly invested enough in the people to fight for them) then getting tutoring for Rebecca's new powers and potentially forging a relationship with a spirit might make it worth her time, but if that's the case, she should hold her help as a bargaining chip.

"I shall collect the demonic practitioners I left in the fields and show your people how to remove the foam. Do you have a location I should deposit them?"

"The graveyard will do as well as any other." A scowl.

She was actually thinking of delegating the defoaming so she wouldn't have to do it all herself, but she decides that it's not worth it, with the communication barrier and how she hasn't figured out yet how to scale the process easily.

"I shall kill those still alive and pile their bodies in an open space at the graveyard, then. How can I identify the graveyard from the air? Or I could burn their bodies in some flat land past the fields, if that would be more convenient?"

"I wouldn't dream of burdening you with a task you did not wish for. The graveyard is the field on a hill with rows of memorial stones."

"It will be a bit easier to burn them than to remove the bodies from the foam, and if I don't remove the foam before putting them in the graveyard it will be difficult for your men to dispose of the bodies. But if your funerary customs even for the dishonored dead do not permit burning, I would not take offense."

"Burning is also acceptable, as we can bury the ash. The ceremony is the most important. Thank you once again."

So she has to collect the ash, then.

"Do the ashes of each person need to be separately stored, or will collecting all in one container be also acceptable?"

"Ideally they would be separated... And identified by name, if possible."

On the one hand, he doesn't want to annoy the wandering master. On the other hand, she obviously wants to do things properly and cutting corners might annoy her, instead.

"I will be sure to prepare a guest room to your desires so you might rest after this task."

She tries to imagine the logistics of it for a second.

"It would be appreciated. I don't need much, so an ordinary clean room with a bed and a desk will suffice. For the remains, it's acceptable if there's no way to differentiate to whom each set of ashes belongs, as long as each set only belongs to one person? The belongings that were on them will be mixed in, but the heat may render even metals and jewelry destroyed or unidentifiable."

"Acceptable. The courts of Hell will sort them all out. I shall ensure a good room is ready for you."

This is stupid. If she digs a big hole and makes a pool of dilute solvent...

"Setting aside practical concerns, do you prefer the separated cremation or to handle the bodies yourself? I just thought of a different way to remove the foam from all of them efficiently, so it will be the same for me after all."

"We will be glad to handle the matter and reduce your burden, if you wish, if there is some way to remove the foam. I apologize for my confusion."

Internal sigh.

"I am currently without some of the techniques I am used to, and so am somewhat poorly organized; that is my fault. I will return the bodies to the graveyard."

He just bows.

Miss fox appears, in her small form, around a corner down the street. She has a pair of bandages around her. She just stands there and peers inquisitively.

Rebecca turns to the fox and offers a light nod. "Wen Huli—I am unsure how you prefer to be addressed. I meant to speak with you, with an apology and perhaps a request, but I have some errands to run first. Is there a place I can search for you afterwards?"

She turns her head back towards the fort, which is obvious enough. Then a slow nod, and turning around to trot away.

She gives one final nod to Gao Gao and flies off. She finds a location far off, away from the farming fields, to start her project.

This is what she's going to do:

1. Dig a big hole with her bare hands. This sounds difficult, but it's actually very easy when you don't need any leverage and can just fly using your body as a shovel. The resulting hole is messy, but functional.
   
   
2. Dressing Room herself clean... or something. She has Personal Hygiene, which didn't make dirt not get under her fingernails, but Dressing Room's wording doesn't sound like it covers dirt under your fingernails, and when she willed herself to become clean, her fingernails and clothes both became clean, so whatever the interaction is worked.
   
   
3. Dressing Room a few huge plastic cloaks to line the hole. She makes them with waterproof zippers on the rim and zips them together.
   
   
4. Fill the hole with water somehow. She forgot to plan for this part, and she has to produce a hundred thousand liters of water somehow, which Dressing Room isn't going to do for her. It takes her half a minute to figure it out, but she eventually turns her Perfect Hair into an absurdly large amount of soaking wet hair, and let the water flow down into the hole. It takes two tries to get hair that's actually dripping instead of just damp, but it works. The hole is now full of water.
   
   
5. Dressing Room into the back-mounted solvent sprayer that they decommissioned back in 2006.
   
   So there are two problems with solvent sprayers. First, a solution that's too portable makes it easier for criminals to get their hands on; the current standard is spraydown rooms, with the solvent mixed and piped in from a separate location. Second, the naive design of a portable device doesn't have enough capacity. You can have a foam sprayer because it's a compressed liquid that expands in contact with air: a full foam sprayer can produce more than 50,000 litres of containment foam from an 30-litre tank. A 30-litre solvent tank produces 30 litres of solvent, which is enough to do nothing.
   
   Instead, the solvent sprayers they used to have were meant to be plugged into a water main. The pack just contains the solvent powder, which is mixed into the water flow as it comes out. The problem here, of course, is that there are no water mains to plug a sprayer into. Which is why she needs the pool.
   
   
6. Unload the solvent powder and dump it in the pool, repeat three times, mix well. Back-of-the-napkin maths makes that twice the usual concentration of solvent, which is good and fine here because she's not going to be washing alive people.
   
   
7. Find the foamed people and bring them over by the pool, still foamed.
   
   
8. Dressing Room into a pair of excavator claws and rip off the excess foam. She's used a few different models before, but something that looks approximately appropriate comes in without her specifying one. She's fast and strong enough that she can tear the people out of their foam bubbles, only accidentally stabbing a few of them. She snaps their necks quickly before they're mostly free.
   
   
9. Throw the foam-clogged bodies in the pool as she goes, dipping in to stir the water now and then.
   
   
10. Fish the defoamed bodies out of the pool once all is done.
    
    
11. Throw the removed excess foam into the solvent pool. Stir until dissolved.
    
    
12. Upend the plastic lining and let the water drain down the hole. The correct way to dispose of the dissolved mixture is evaporation and incineration or hydrous pyrolysis, but she can't think of an easy way to do that. It's somewhat nasty plastic pollution by US standards, but at this amount, even assuming groundwater flow takes the material straight towards town, it'll be dilute enough by the time it hits the crops that it wouldn't even register on the EPA scale. There's a reason she chose a good distance away from the fields.
    
    
13. Fill in the hole with the dirt she displaced.
    
    
14. Incinerate the plastic lining with a Dressing Room flamethrower. Specifically, she douses the gathered pile with most of the fuel tank and lights it. She chose a flammable plastic which burns clean.
    
    
15. Wash down the corpses with more Perfect Hair water while the plastic burns.
    
    
16. Take the bodies back to town as the last of the plastic burns out.

Are the demonic practitioners and the local environment cooperative with this plan?

The one relatively more powerful one tries to escape again, but fails.

The water pool acquires a bunch of bloody energy during this process, but not enough to seem very dangerous compared to the background level.

She will adjust the procedure to attempt to splash the water across a flat stretch of land instead of letting it all drain down the same hole. Then she waters the affected land area down with Perfect Hair again.

She is never using containment foam without a plan to dispose of it again.

A few people will take the bodies with acceptable levels of solemnity and mostly hidden hatred, covering them in plain sheets and lining them up near all the dead civilians.

Looks like a total body count of 187, 26 of which were blood users. Unless some of these bodies were already thralls beforehand.

She's not going to stick around. After the last one is delivered, she'll hover for a few moments in case someone wants to call her for anything.

(A few bodies ago the plastic finished burning up, and she's cleaned up the remaining debris. She forgot that the zippers had metal, which she scooped up with a handful of dirt and vanished with Dressing Room—actually couldn't she have just vanished the plastic cloaks with Dressing Room? Can she tracelessly destroy arbitrary small to medium objects with Dressing Room?)

A kid shouts out that she let his mama die.

His surviving relatives shush him very hard and shuffle him away.