"The ideas are not to most welcome but from what we've seen, he does care about the people here and of you."

So the reason why Rhea stayed was because she was friends with the head scientist and despite the uneasiness of the guests, Cyntia was apparently trying to do good. Yu couldn't stay on one side or the other; both had good points but there was also bad. However, something was nagging at him...

"There was something else he said that I have to ask: the miasma had a chance of leaking into other worlds before we arrived. Is there still a chance it could happen and is that why we were brought here?"