I agreed with lotus1. Fire pujas are known to be the king of puja and is the most powerful puja. If Dorje Shugden cant be "destroyed" by fire puja it have 2 things to say. (1) Dorje Shugden is enlighten, fire puja do not eliminate any enlighten being. In fact, they are invited during the puja to help eliminate the negative karma of the sponsors. (2) If Dorje Shugden is a spirit and fire puja cant do anything, are we saying that Buddhism ritual is useless to eliminate negative spirit? Are we saying that the Buddhism ritual cant do anything on spirit? I doesn't make sence.