Scavengers Reign finale spoilers ahead:
There's something about the way Levi was the solution to Hollow, like... Kamen and the creature were in this feedback loop, right, making each other worse, isolated and focused only on each other. I was so unclear about Hollow's behavior and possible "motives" as it grew -- it wasn't behaving like an animal filling a niche in an ecosystem, but it didn't seem to have goals that made sentient sense either -- until I realized the extent to which their psychic bond went both ways. And nowhere was that more breathtakingly clear than when it found Fiona's body, looked at her with what seemed to be deep and genuine sorrow, then laid down beside her. Who knows if it would ever have moved again if she hadn't been destroyed. Like. This was a creature initially in tune and connected with its surroundings -- we see how the other members of its species go about their business -- until it enthralled Kamen and the two of them started feeding this circular obsession with themselves and Fiona, to the point that Hollow left its forest and trekked a vast distance to an alien hunk of metal that offered no sustenance, to go sit alone with a corpse. Completely disconnected from its home and the life on this planet.
And then. And then what breaks it, what boils away the monster, is this massive connection. Levi's deep and profound connection with the vast network of living things all over the planet, all intertwined -- it utterly overwhelms Hollow and Kamen, peels the creature down to a version of itself no longer bloated with the completely self-referential miasma it and Kamen had fostered in the closed system of their psyches.
And it gets another chance! That new little creature gets to go back and become a part of things again -- and so does Kamen. When we see him gently releasing that little green animal into the vibrant forest... That's the least selfish thing we've seen him do in the entire show. It's quite possibly the least selfish thing he's done in years. It's a step outside of himself, finally.
And I think it's interesting that the crucial moment was when the creature tried to enthrall Levi; it tried to suck Levi in the same way it did Kamen but Levi utterly RATIO-ED it through the awesome power of already BEING connected to a degree infinitely greater than the link Hollow was offering. Hollow couldn't contain all that; its capacity was too small. just. MAN!!!!