Used: Ice Storm II

The Ice Storm spell is  
calculating damage separately for each target. Would help a server a bit
to have it roll damage once for all targets.

Just looked at the code for this spell, and it's calculating the damage
once (well, once for bludgeoning and once for cold), then applying
damages of the same amounts to all in the area.

I know you said the code is showing only one calculation, . Here is some evidence to suggest otherwise, note that both the physical and cold damage are in different amounts for each enemy, and also note that there is no cold resistance being applied by any of the enemies, only physical damage is having reduction applied... so the differences in the cold damage (or the amount absorbed by physical damage reduction) wouldnt be due to the creatures having different resistances, either: