I knew you could beat it but there's something a bit strange.

I offloaded at least 6,000 when I got a full time limit zell's limit break when I fought it on the bridge. You can kill it at this place. I would have thought it should have died because it has less than 6000 HP but it didn't. Not quite sure why. I then proceeded to beat it senseless for ages but it didn't die.

Bah. Next time through I'll get it.