One of the rules they absolutely know is that they have the follow the mascot. Having everyone escape alive is something they’re not entirely sure of, with only one precedent to support it. You have to stay close together, but it could be entirely possible that you could just drag around the corpse of your teammate and it still counts. She’s been established as a character who’s lost some of her humanity, so whatever increases the chances of her own survival is most important to her. Also the researcher is annoying anyways.
In fact, novel spoilers below
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You don’t technically need the whole team to clear. I believe another team was doing as I mentioned and was dragging someone’s corpse around
Tbf, her whole team can be such an assholes, it doesn't help they also have such an elitist behavior due to their rank, and one member of their's will be evident later on. I have so much to say about this team but I might be spoiling stuff... Anyways, as the story progresses, you won't see them as much.
I know her personality is not.... the very best, i think everyone who got promoted or in the elite team have something wrong with their personality or just not right in the head, because i'm sure they've gone through much more dangerous horror stories than other employee and that must have messed up their moral, mind you there's not a single normal person in daydream company except for the people *outside* the exploration and research team (excluding executives cuz they made/operate the damn company from above)
I said that because of what mc said in ch24 about how only 4 civilians cleared the darkness so they likely have to play as a team and the butterfly mask was pulled by balloon strings tied on her neck when she was going to move alone .
But she does jump to the conclusion thou. Isn't that the worst thing a person in charge should do. I get that she is selfish but it's dumb to follow what a darkness is saying.
Its just my opinion thou.
It's my first time hating on a character on their first appearance and especially a female character.
Sorry for the yap but here I go
Normally the standard procedure to clear a darkness is to listen to what it says and complete it and leave like in the trainee test thing, emotion train when the conductor gave instructions like to sit down or find the missing eyeball it's likely helpful
And even how the instructions in the theme park and how they guide u on how not to anger the red bunnies
If u had a task like hug the mascot or like they said eat something delicious it's easy to complete so u don't need to be wary but as time goes on it gets harder and that's why soleum didn't want to listen yo the mascot even when it's important bc if u don't listen you'll not be treated as a guest and get attacked by the bunny
So as much as hate her I think butterfly was right in that choice just very apathetic and she didn't think ahead

Wait but can we talk about how unreliable that butterfly mask girl is . She didn't even think twice to kill that person . Like MC already said that the survivors from this was 4 and if one die there's a possibility that others also die . And she said kill the other guy? Like girl use ur brain