"I wouldn't worry about them much. They seem to come with powers and skills of their own. Most of the ones who knew they weren't able to fight or help, they would stay safely on the train and it's okay."

He points to his SCA, "Also I would like to remind you if you don't mind. In case of an emergency or life threatening situation, you should tap your SCA three times and you'll be teleported back inside the train safely."