I'm pretty sure they're reacting to the one who got loose, 'Twila' if the name left behind in the container was correct. I'm basing this on the interactions I've seen and the few I've had with people with Twila attached to them.

Twila was in a small box in the depths of the caverns and lower levels that someone else had opened this past week. The caverns were in shadow while the box was still sealed.

The box itself was old and the lock on it practically rotting, that was obvious even with just touch to give information. It took no effort at all to break it, especially with Twila's influence to push the matter. If there's a way to 'put it back', I would suggest a far more secure method next time. Something that can't be reached physically, if at all possible.

When Twila left the cavern, it took the shadows with it.

It will latch onto something you want and push you in that direction in order to bond with you. This is how I got persuaded to open the box where I found it instead of taking it to the surface and getting hold of other people first, which was my original intention.

I suspect the ones with Twila inside may have to decide to give up whatever it was that was offered or pushed to be sought out; I don't think that'll chase it out, but it might weaken it.

The other spirits might be bonding to people to keep Twila out. It's the impression I've gotten from Tsinku. I think they might leave as well, once this is settled.

That's about all I know, or can offer.