So... 10 man naxx up till KT.. Have undying so far. Go to do 8 man KT cause we have two people that just need KT for the acheivement.... he's at 20%.. tank has to move him due to a fissure on the tank... the two melee get too close evidently and the warrior dies...
Add onto that that one of our guys screwed up on shocking at 20% as well...