The one where he jumps up, dive bombs, and creates shockwaves?
Were you somewhere near the point of impact? When he jumps up, that's pretty much queue to scatter from the middle of the map. Or, when he jumped, he hit you with that frozen ailment? That did happen quite a few times in 9-7, so I was rather surprised then, but staying away from the center, where the point of impact is, allowed my party to escape from his dive bomb attack easily.
The duo tornado is what I can't dodge. Then again, if I get hit by 1 of them, chances are I won't get hit by both (because I'll let myself fall to the ground gracefully, and not recover mid-flight). And the damage from the tornado isn't something an hp pot can't fix.
I actually had no problem with this quest with a party of four... Now, dealing with him in the extra quests is a huge PAIN, that I must've failed 30+ times until finally I managed to get a great party and leveled myself up quite a bit and we destroyed him first try.
Haha. I'm probly gonna start using mage too when i help out my friend when i give him his copy because i got a staff that has splash potion and attack up 3. Figured i need the healing trophy and it helps him so why not lol. Haven't used a mage yet so idk what its like.