Unstoppable vs bosses on their own?

[dukereg]

Just wondering if builds relying on Unstoppable to avoid dying from massive damage have some way of dealing with bosses with no mooks around? I mean if it wears out while they still live and you only get back 1 hit point (because there weren't any walking health packs nearby), any hit will kill you afterwards, right?

[Theyleon]

If you're not going to kill the boss during unstoppable, then you use the last turn to pop a movement/phase door/teleport/etc and get the hell out of there. Then you heal up and try again and/or dodge the boss.