The only thing I can think of that would get a similar effect and would "work" in my mind would be if it was a particular phase of the fight where it entered either a counter attack state, where it's attacks are survivable, but not if you're going nuts ((Think the first bosses IV through VII, ignoring VII's notorious parsing problem. A lot of them you could survive a counter attack, but probably not more than one is a row)). Or an phase where it reflected your damage back at you. You'd still probably want to attack, but maybe cool it a little.

And cue people Making Vit gear specifically for these bosses.