Well, wasn't that exactly supposed to be the difficulty? If it DOES burst, YOU WILL DIE. Unless you have 90%+ damage cut up. Rage or not, debuffs or not, 90% or 95% or 100% damage cut or you WILL DIE. Seeing as you got the Stun on the very last turn, it doesn't seem like you had a lot of extra time either.
Well, will get to test things out later today.
-- Slashley