I think I've heard that the death explosions are half fire, half physical, and are based on the life of the base monster type. The reports of huge damage from fire enchanted monster deaths make me wonder if it might be interacting in some nasty way with other boss mods.
Edit: I see Ferengi has already posted about what I said in my first statement. Also if the damage is scaling with number of players as Brista seemed to suggest, that could explain 1 hit kills.
Edit: I see Ferengi has already posted about what I said in my first statement. Also if the damage is scaling with number of players as Brista seemed to suggest, that could explain 1 hit kills.