You'd hopefully be killing them before they managed to cast anything, lol.
You can see where meteor shower is being cast, so just being outside it's zone is good. I usually tele when they go to spiral unless I know I have the hp to live though it, and you can see that skill being cast as well and have enough time to fwing or something. I don't get hit much, if at all, by fireball while wearing jakk muffler and fire armour. And fire pillar is fine, just don't walk into it! xD
I find that if I'm getting hit by anything other then a melee attack, I'm not taking to much damage. Fire Imps are really the only thing that do any real damage if they get close enough.