Keeper, I think you are right. The aftermath of an epic battle - silence descending, the cold and stillness slowly covering the cries of the dying, a reminder that those ghosts and trolls were once people, the beasts once loved pets or wild or domestic animals, whatever may since have overtaken them and warped their natures. We have been shown this in story: the unfortunate beast-dog that came to Emil for death and mercy when it remembered itself in the touch of the sun, the girl on the train, the one with the heart jewellery, who asked him to help her (and what is it about Emil, I wonder?)
And once more Minna has done something different and interesting with a common trope in such tales: normally, scenes of this sort are set in the falling dusk, the lives going out with the light. She sets the scene against the first light and colours of the dawn. Yes, it induces the 'pity and terror' which the old Greek dramatists considered appropriate for such things. Yet it also seems to me to contain elements of hope. The growing light and colour are part of that, but did you notice that in the foreground of the last scene with Sleipnope, those two beasts look a lot more like normal animals than beasts usually do, as the beast-dog did when it came to Emil, as against how it looked in the school? Maybe the fire-and-iron light of Kokko serves the same purpose as sunlight?
I agree that the place for seeing what happened to Tuuri, Onni and the others is at the start of the new chapter, among what passes for mundane life in this tale, whereas that space in the last scene could only be called liminal. As I see it, for all that the story Minna is telling contains fluff and friendship and light-hearted moments amid the basic travel and adventure elements, she isn't making a trivial tale. She is building a quest saga. Sagas need their darkness to contrast and strengthen their lighter elements.
Sc0ut, I would read you from your art and conversation as a gentle-souled and sensitive person who hates to see suffering, possibly because it is too familiar to you in real life, so I think I understand how you feel. But don't give up on Minna's work yet. The story is still only beginning. I think as the characters develop they will be shown thinking more about these issues. Perhaps, Lalli, Sigrun and Mikkel already do - they have experience in the world outside the cities and fortified camps. Remember Sigrun talking about why she didn't join the navy, because she hated the way it was necessary to kill seabeasts, by beaching them? And I suspect that Reynir, having lived his life on a farm, understands about killing in mercy being sometimes necessary. Emil comes across as an innately compassionate lad under his superficial layer of rich brat. Actually, Tuuri seems to have most to learn in this respect, and if she survives this experience it may school her in consideration for other beings.