Ice Man has constantly become a much cooler (pardon the pun) character with the passing decades (remember he was once only able to turn into a snowman and hurl snowballs, but is now able to instantly freeze a person and is virtually immortal), but i doubt even he can withstand a Nova blast from Johnny boy.
The guys packing heat (pardon the pun, again) win this without breaking a sweat (pardon the ....what the heck).
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He can. I think it just comes down to the quickdraw thing again. Iceman is capable of instantly taking away Torch's flame and freezing every molecule in his body. Can he do it before Torch just flat out melts him? Maybe. Maybe not. 50/50.
But I will say that I'd rather have Iceman's power than Torch's power. Iceman strikes me as being far more versitile and being able to do a lot more with his power.
Mr. Freeze vs. Pyro is definitely in Pyro's favor. He can leave the battlefield and let his creations do all the work for him.