Mei is going to constantly emit acid mist from her mouth kind of like how it will be hot near a camp fire even if it is surrounded in cold weather.
Chemical reactions don't behave like heat lol. In normal pressure and temperature, they react in contact. As soon as Mei emits her mist, it reacts with Zabuza's. Mei can keep releasing it but as i already adressed, her limit of how much acid mist she can release should be below her limit of normal mist, not to mention that she can't keep the boil near her at her own will. So it will be DISPERSED + DILUTED.
Sasuke was inside susanoo which means he was only exposed to a small amount of acid mist.
Sasuke's ribcage clearly has space between the ribs for the mist to enter.
Mei can hear water coming to her location from a long range even before she sees it.
Yes, but she can hear it when the water already started to move ==> Zabuza already changed location
Unless you think Zabuza can make his water silent too. So as soon as Zabuza begins forming the jutsu, Mei hears it and prepares her own to counter.
Overrating Mei's reactions. She'll hear the jutsu FORMING tho it is made really fast (Kakashi finished the seals and said the name of the jutsu just an instant before Zabuza, and the jutsu just fired itself and Zabuza couldn't even launch his). So there's no form of Mei lauching her counter BEFORE Zabuza's is fired.
If we look at feats, Zabuza has no technique that can get Mei from long distance
Med range is enough. Mei still doesn't have the reaction to accomplish what you claim.
so he has to come in mid range. Proof that Zabuza's water clones are powerful enough to do jutsus of
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level.
When Zabuza made 10 clones, he said they were one tenth his power. While only one clone could handle Kakashi pretty well, and shitstomped Sasuke, who at the same time shitstomped Zabuza's 1/10th clones, so one clone should be able to roughly make the same jutsu. Kisame's water clones could make jutsu as well, and Kisame has only 30% of his chakra, and it was divided on 3 clones, and they still could make water prison and some other fodder water jutsus without breaking a sweat. Then we have Kakashi with raiton Kage bunshin (which is a normal kage bunshin infused with lightining by databook) able to use raikiri dog. Clones using jutsu is pretty underrated. If Zabuza uses fair enough chakra on his clone, he could pull it off. It's one attack he needs. Even if Zabuza's clones can't accomplish this, he can do this:
1- Sends a bunch of clones as sacrifices inside the acid mist to distract Mei even for a second
2- At the same time prepares the jutsu
3- Fires it and as i stated before, Mei having her counter ready by that point is impossible
The clash of the two water jutsus would disperse even more the already diluted and dispersed mist =Zabuza can get close range and finish it
That's true. I mean raiton kage bunshin Kakashi should theoretically be immune to a stab just like Enel from OP but this logic doesn't work with elemental kage bunshin.
Plus raiton Kage bunshin is a kage bunshin infused with lightining, so it's like the bunshins, weak AF and when it "explodes" it electrocutes. But anyways, they are certain types of clones that don't follow this rule, for example:
-Gaara's sand clone is in fact a bunch of sand moving, and won't dissapear for getting damage
-Hashirama's wood clone could still move and restrain juubito despite having half of his body taken away
But this rule doesn't aply to Zabuza's clone since one of them dissapeared by being stabbed by Kakashi and Sasuke.