Does Leviathan Cheat?

[Vaer]

Actually.. I've never personally encountered that. What's the Ifrit sudden hard enrage about? For me there were once we fought Ifrit EX with 3 BRDs and we DoT the hell out of every single nail and ended up like half of them exploded back-to-back (with probably time spare before he cast hellfire) and that resulted a wipe

Pretty much the same as here. If Ifrit hits a certain % while the final nails are still up he will just wipe the party with a nails still up Hellfire. I'm assuming it's there to make sure you don't just ignore the last nail phase and just burn Ifrit down.

Can't stop DoTs already on Ifrit from ticking though so sometimes accidents happen when the DoTs push him below the threshold.