Wait, Alucard isn't much more poweful than Alexander, who is like Hellsing's version of Wolverine without the adamantium skeleton and claws. But with some lesser magics.
If Alucard could turn into mist being inhailed and so forth, why the heck didn't he do it against Alexander, in the first battle? Or the second etc.
Human Torch's supernova would destroy Alucard, and mist wouldn't get close to him either considering his body temprature.