No, actually, Lea didn't know that. Xion was clearly acting unlike her usual self, and so far as he could see, it had started when the potion had splashed on her. But as his mind began find its way out of low-key panic-mode, he began to realize that the things she was saying were too specific to be outright caused by the potion. It was more like, the potion was just drawing things out into the open, like it was meant to draw out impurities in metals or bring to light flaws in gems.

But it was Xion's tears that really drew his focus. No time to panic now. Xion needed him. He reached out and rested a hand on her shoulder too, next to Roxas'. "Hey, it's OK," he said, his tone soothing. "Just try and calm down, take a deep breath, OK?"

"I don't think people can really change houses," he said trying to continue to sound comforting even though he was delivering news that Xion didn't want to hear. "But there's nothing stopping us from visiting him, or vice versa. And anyway, Roxas is right. The link between the two of you was broken when you returned Sora's memories. Nothing bad's gonna happen to him when you use your Keyblade or magic, alright?

He then turned to Roxas and explained. "I got a potion to use in my Forging projects and it got spilled on Xion," he said. "Don't know what all was in it, just that it wasn't meant to be used on people, so it's having some unforeseen effects. But I don't think it's actually causing this, just bringing out what was already there."