1> How much damage does mana burn do, on average?
2> How much damage does the suicide nuke do, on average?
(include crits, etc, in the above)
3> What is the regeneration rate on the mob you are fighting?
4> How fast can you switch characters and land another mana burn?
Damage done per wizard: (MB+SN-Regen*Switch)
If this is higher than the mob's HPs, you can kill the mob using this technique.
It is an interesting technique, in that it does not rely upon tanking, and the mob's DPS output is not important to how difficult it is to kill a mob.