You learned how to use the spoiler tag?! OMG, I still haven’t figured it out myself— you’ve got to teach me! Also, congrats, Jasmine~ I love the new name, by the way. <33
Okay, so I’ll try to avoid spoilers as much as possible, but here’s the gist: Kai did something in the past (back when he was the leader) that turned him into an outcast. Because of this, nobody really cares what he does as long as he stays out of their way. Oh, and unrelated side note: I tweaked his dialogue with Helios a bit to make Helios seem less suspicious to new readers. I felt like I was overemphasizing how much Helios looks down on Kai, so I toned it down a little.
Anyway, Kai is helping Sev because he wants something from her. (Spoiler alert— I can’t go into details yet!) For the first event, where the fake Shyloh (shapeshifted Rosario) attacks Sev, it’s actually part of their plan. They’re trying to make Sev believe it’s really Shyloh to give her a false impression of him.
As for the second event, that’s more Kai-driven. The veil he gives Sev helps reduce her pain (or maybe it’s just a placebo effect, like covering up a wound... who knows?) The other pixies don’t really care about this because, from their perspective, she’s going to die anyway, and they’ll get her pure life essence regardless.
Now, about Shyloh and Helios’s choking scene: Helios hadn’t given Shyloh the signal yet (he even explains this to Sev when she asks about it). The whole ploy was to paint Shyloh as the bad guy, and if the others intervened, it wouldn’t have had the same impact. Similarly, with Rosario, they didn’t care about her actions as long as the end goal—Sev’s death—was achieved.
Ultimately, Helios doesn’t think much of Kai because of something Kai did in the past. This event still affects him and his interactions with the others. Even Kai’s effort with the veil doesn’t change much in the end because Sev still dies. That’s kind of the theme with Kai’s arc; his good intentions don’t always change the outcome.
In terms of intentions, they’re split: in the first incident with the veil, he’s aligned with the pixies because he wants something from Sev (and no, it’s not Ehsas like the others want). In the second incident with the pixie's ending, his actions seem well-meaning, but whether or not he succeeds in getting what he wants is left ambiguous; it’s something tied to his route.
Hope that cleared things up a bit more! By the way, do you think the whole veil situation is a little confusing? If so, I could look into clarifying the demo text to make it easier to follow.