Xion being concentrated on the task at hand, she didn't notice his struggle with that certain piece. She was far too gone delving into the current situation and perhaps part of it was just trust in Roxas himself. They had both been through a lot, worked through a lot of their own obstacles by themselves. At least that was something she tried to hold to, but all the same, she hadn't exactly been lying when she had told him that she always worried about him, too.

And that worry took root when she heard the loud crackle only a few feet off from her, caught a shift of abrupt motion. And she turned her attention to Roxas just as he began to fall away. For a second, she just stared- but then her body was going on auto-pilot, prompting her to scramble to her feet. Then, she was running a few paces, sliding the rest, and launching herself when her feet found the right timing. By then, he at least had seemed to recall old habits, flipping through the air while most would still be stuck in a free fall. But that hadn't stopped the way he landed rather roughly.

The train rang with a hollow wail as Xion planted her own weight on its hood, falling to a knee momentarily. Her body still just not quite used to that kind of movement and abuse that she had always gotten away with before, being what she had been. But Xion soon recovered and took quick steps to break the distance between her and her friend, in the last moment sliding onto her knees the rest of the way. Her hand outstretched but it seemed as if she wasn't quite sure what to do with it. Trying to get a good look over him. He seemed alright. Or was he?

"Roxas! Are you okay?"