Maru just have a low grunt. Why wouldn't he worry about it? The world shaking and now storm clouds blocking out the sun? He thought there was a lot of things to worry about. He wasn't much of a religious person, but it was looking rather biblical out there.

"... I wonder." He did. He would try and keep Madoka and her people safe. But beyond that, he wouldn't be surprised if not everyone returned to the train once the mission was over.