I get that Lalli's desperate to save them both.
I get that Lalli has incomplete training in magecraft.
I get that Lalli can be socially inept for whatever reason.
I get that Lalli is way out on a limb and doesn't know what else to do, and I applaud what I see as his thinking outside the box to find a solution.
That short-term victory is not at hand yet, even, and it can't be won by turning Emil into an automaton who has been beaten into submission.
Much was made on the last page about these first steps toward turning Lalli into a kade, and even now I don't think that is what's going on, because of the canon lore about envy being the core of the path of the kade. I suppose you could squint and hold your tongue out funny and say Lalli is envious of Emil's cushy upbringing, but I don't see that, really. It is no less a dark power, though, and the fact that Lalli has excoriated himself as the blood sacrifice for the torture does not render it any less sinister, quite the opposite.
The knowledge that you can make another submit to your will through torture (and there is no other word that fits what Lalli has been doing), is not something that is easily recovered from, for either party, even with all the support our world can provide. These two do not have that support and any rapport they develop will be under the shadow of this submission.
If/when Lalli gets back to his own body and the language barrier comes back into play, the only communication they have that lasts is that experience of pain and mind-****. The most Lalli-torturing fics the likes of Aliax and Dvergamhrar have ever written start to broach this territory, but now it's canon.
It's right up there with the sinking of the refugee boat by the Icelandic government as a really dark moment, and far worse than Tuuri's suicide imho. I think this goes beyond merely being an illustration of the harsh reality of a fictional post-apocalyptic society; this is a graphic illustration of the indelible personal corruption of two individuals. And I'm on the record here, saying that I hate it.
I'm not outta here, I will still be there Monday to see what happens next (even though I doubt anyone would miss me within a few weeks of my departure). The story I have been working on will take a back seat this weekend, in favour of work on a darker-toned one I had planned but not started.