"Lights will guide you home... and ignite your bones... and I will try... to fix you." ~ Coldplay.
"I'll always be there to bring you back!"
Axel didn't make promises lightly. Yes, he was known for being a professional liar, but when he swore an oath to someone, he kept it. And when he made a promise to a close friend... well, then he NEVER EVER permitted himself to break it.
Xion may have been broken. She may have been about to die. But she was also his closest friend, and that alone was reason enough to do everything within his power to put her back together. He'd said he'd bring her home, and he definitely meant it.
Someday, hopefully soon, he'd bring her home. After all, he'd promised her. There was no choice now. He HAD to – and WOULD – rescue her.