We all know that the ice-related spells should also slow their opponents > see "SpeedMult" effect connected to all Ice Spells (except Frost Rune for an unknown reason).
But the game fails to apply it because actor speed is only checked when you do an action that changes your speed. As long the "frosted" target does not start to sneak/block the change in speed is not applied.
BETHESDA: Please fix this!!!
I'm not exactly sure of the specifics (Under the hood), but there does appear to be some inconsistencies in how frost spells apply their slow (For example, the slow never appears to be applied if I dual-cast; the most consistent way that I have had the slow effect applied is to just continuously tap the frostbite spray in one hand). Would be nice if it was fixed, as the secondary effect of Frost spells (Damage Stamina) seems to be rather useless. I say this because it appears as though enemies can sprint and power attack even if they're drained to zero stamina and you can't make their stamina go into the negatives like you could in Oblivion.
In any case, I approve this thread.