Don't believe me? Buy a few liters of liquid nitrogen. Put your hand in it. The Leidenfrost effect(which only applies to cold liquids, not cold air) protects it from turning rock solid for the time being, so leave it in for a short while. A minute or two. You better not be too fond of that hand though. You're not getting it back. Once you're done, drink a mouthful. At best your mouth freezes shut before much could reach your throat. At worst you've just lost your stomach, and you can watch as the nitrogen boils away to 20-something liters of gas, tearing apart your insides.
That was a mouthful of extremely cold drink. What do you think a 60 feet long area of extremely cold air would do to those standing in it? Sure, it doesn't kill you instantly(that's not even possible), but I'm still going to stand over there, far, far away, if you don't mind.
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