Luck was not with us all night during our Immortal Naxx run. 

We survived a DC during Thadius that required our "Negative Side" to repositon to a new location on the fly which then lead to us killing him 5 seconds after the enrage and seconds into a 1-shot on our tank. 

We suffered another DC during Sapphiron that required a Divine Guardian plus a Pain Suppression to get through the Frost Breath.  

FInally one of our add tanks was Mind Controlled 5 seconds after picking up two of the adds on Kel'Thuzad.

In the end we perceviered with the help of some exceptionally pro play and amazing on the fly adjustments.