[t0mbstone]

Sounds like a good way to introduce frostbite

[JshWright]

Those spots are not prone to frostbite, since the "coldness" gets distributed through the rest of the body very quickly (apologies for playing a little fast and loose with thermodynamics there). This is why they're used in the first place to cool the person quickly.

[meowface]

I don't know the exact implications, but I'd probably rather have frostbite or even lose a limb than have serious permanent brain damage.