Has anyone found a half way decent way to learn this spell? I've fought the khimaira several times in Nyzul Isle and it simply refuses to use tourbillion no matter what the condition. I've also read that the khimaira may not even use it in the Assault mission either. And if that wasn't enough, the 2 Abyssea NMs don't even have access to it.

So, is there any way to reliably learn this spell that doesn't involve camping a 24+ hour HNM or finding some obscure person on the ToAU mission?