Empirate: Do you know the difference between a good pun and a bad one?
I used to think that it was a trick question, that there wasn't one, but I realized that there actually is: When
I tell it, it's a good pun.
Delericho, applying real world physics to a situation where "cold" is an energy type is just asking for trouble.
I've had people argure that
Fireball spells can't ignite things, can't melt ice, etc. because "instantaneous" is too fast to do that. Despite the fact that the spell says it will ignite flamable materials and can melt softer metals like lead, gold and silver.
So don't worry about whether an instantaneous effect can do what it's designed to do. It can.
As an aside, I do computer work for the cold storage warehouse industry. They have special rooms called "Blast Freezers". These are long chambers that blast sub-zero air through at high speed. They're used to quickly bring entire shipments, stacked by the pallet load, down to rock-hard frozen in a very short time. They're about as cold an area as we can make commercially feasible on that kind of scale. In total volume, though, they're not that far off of a White Dragon's 60 foot cone shaped breath.
They won't kill a man instantly. They won't do anything but "non-lethal" damage to a man in under a minute of exposure.
Now, give it 15 minutes and that man will be dead and frozen all the way through (so much more surface-to-volume than a pallet load of seafood).
What I'm saying is that a spell like
Cone of Cold or the breath of a White Dragon or a Winter Wolf can and will kill a normal, healthy man almost instantly, a feat well beyond what commercial grade freezers can do, at their coldest point. So think of those spells and attacks as being more like sprays of liquid nitrogen or something similar. Not just cold air, or even Arctic-cold air, but as something that actively sucks the heat out of the target.
And yes, that *could* freeze water instantly.