He hadn't been expecting that. Sylar knew this was a trick, he knew it, but he was getting to see her smile and so he couldn't quite bring himself to care. "Mommy?" he asked, already stumbling towards her. He was still having that problem with his legs, but he seems to be making some progress. Or maybe it was just because she was walking towards him.

"Mom, are you o- please be okay." A tear trailed down his face- he didn't even notice it. "Please, Mommy..." he repeated quietly, desperate.

He'd been adamantly holding onto his sense of self- he knew who he was and what had happened to him, and he knew that what he was seeing was just a memory-- up until this. Now he wasn't paying attention.