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When the spell "paralyze" or "mass paralyze" is cast on the ice dragon (when it's fighting the player), the dragon freezes like normal. However, after the spell wears off, the dragon is unable to move, attack, or do anything else. It can still be damaged, which allows for a very easy kill. The dragon is locked in the animation it uses to move, but stays in place. I noticed that a large amount of damage (i.e. from the enchanted meteor saber you get from the bone cheat, which I used to make sure this glitch wasn't just for my character) will knock it out of its frozen state and allow it to attack again.