"I don't know," she said, unsure. "I never tried. But... the Dark Corridors don't let us leave, so I think we have to..." she said.

She wouldn't have tried to stay, because Axel and Roxas arrived when she had. Would she have tried to stay if she had arrived alone? She didn't know. Probably. Would that have been better than being on the train alone? She didn't know.

"You're going to stay?"

If anything could get Xion past her fear, it was curiosity. It didn't always work, but it was working now. Specifically because she was now wondering if Xenas ever showed up if they could arrange to leave him behind...