Xion was still trying not to be seen much. She couldn't help it, it was habit. And she still didn't know who would be able to see her and who would see just a blank puppet. So she kept her hood up. All the time. Axel wasn't in this class, so she had almost skipped, had wanted to skip, but with Saïx sniffing around, she figured that with other people around he couldn't corner her so easily as he could if she were out on her own in the halls. So she had come to class.

And was already regretting it. She had mostly been staring at her hands throughout the lesson, listening without watching or attempting anything. When the other student got called up she tried even harder than ever to be invisible. When he turned to snap at her, she realized that her hand had been out to one side, a desperate attempt to conjure a dark corridor to RTD. Her hands came up to make sure her hood was secure as she flinched back from the boy... and the imminent disaster.

I'm sorry, did you expect Xion to be able to FIX anything? A broken mirror like her?