My main team is level 63. The enemies (none of which are above level 50) are all still able to kill my characters if they aren't using Bubble. Five Bakanamy foes pop up and all cast Pyromania/Sandstorm. Since healing spells won't work until after the casting is done, I have to wait for all of those spells to end before I can heal (oh, and while spells can't be used during those animations, they can still run out, so I'll occasionally lose Bubble in the middle of the animation and be unable to reapply it, even though it was at full strength when the attack started, and I had it prepped for casting already). Like I said, it's not the difficulty that I find annoying. I'd have no trouble waiting and coming back to do this. It's the total gimmickry that the game uses to kill you.