Title: The Many Facets Of Kyouya.
Summary: Kyouya will not be healed by amateur flame users trying to play doctor.
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Kyouya will immediately reject any Sun flame user when they try to heal him.
He's adamant that just because someone can activate mitosis in cells, doesn't mean they know how to care for injuries. A clear example is broken bones. They need to be reset, the Sun can't just magically refit the bone in its proper place.
You need a Mist for that, actually, someone who can make real illusions like Mukuro with his eye or another Mist with access to Verde's device that can make the standard Mist flames real. They need to reach inside, through the muscle and flesh, and then make the illusion tangible to push the shards back into position. Only then can a Sun heal the cracks.
Mists are also the best help in field medicine because they inject their flames and the body takes over, knowing exactly what it needs to do for survival. It's not like the Mist has to control every cell down to the transcription and translation of genes, no. It wouldn't just be almost impossible it would literally be impossible since the Mist would have to be aware of every molecule passing through the illusion, they themselves guiding the movement - no, it's too complex to even guess at.
So Suns do help very much with things like bruises or even large gashes, just the standard wounds that can be complex or simple. It's a completely natural process as well, the flames just encouraging what's already there to split and grow and repair. However, some cells just don't grow after infancy, like the muscle of the heart.
You need a Cloud for that, and not just any Cloud but someone with borderline godly control who can propagate the cells accurately with all of its functionality and be able to stop at the right point with all of the cells fully complete.
Unlike a Sun, Clouds are unnatural healers who force the division, and therefore if the flames are cut off or they aren't controlled well, a cell could only be half finished or it might not have a few key proteins.
That kind of control is incredibly rare so a Storm is needed to burn away the cancer cells or the wrong bits and pieces left over. They're also really helpful with bullets or shrapnel that are stuck inside the wound, burning everything away until not even the heavy metal gas form is left.
Rain of course is a pain reliever, able to numb the area if needed or slow down the heart beats to stop bleeding out - although those with bad control can stop the heart entirely. It can also be used to slow poison movement around the body until proper treatment can be found.
Lightning is good for restarts, mainly used as defibrillators in emergency situations but again control is needed for the volts. In some cases they can force the body to make adrenalin but that has to be in synchronisation with a Sun if the patient is too far gone.
Skies are essentially there to mix the flames when a patch job is needed. For instance, if Takeshi tried to use his Rain flames on Hayato, the Storm flames would automatically fight back. It's like the immune system in the body encountering a foreign substance. It doesn't matter that Hayato is fully conscious and accepting of the Rain flames, his body will push Takeshi's flame out.
There are exceptions, like if Takeshi had a higher flame purity or more control than Hayato he could force the Storm flames to comply. Harmony factor isn't needed when it's the same flame type either.
For this example, a Sky can harmonise the two flames so the Rain will sink in and do its job. It's a constant effort on a Sky's part when the flames mix, because as soon as they stop, the foreign flames are cast out again and blocked off.
Specific to Tsuna is Zero Point Breakthrough, and he uses his ice to freeze the patient until they can get back to actual doctors. Mukuro had his arm cut off once (Kyouya swears it was an accident) and Tsuna froze the Mist quickly until they got to hospital because Mukuro couldn't concentrate enough to re-attach his own arm with illusions.
Regarding medical assistance, Sun has the least risk. Certainly much less than a Cloud - Kyouya takes great pleasure in propagating an opponent's blood until they pop like a water balloon.
He giggles.
It's fucking terrifying.
But back to the matter at hand. Sun has the least amount of risk associated with it because it's essentially just speeding up the body's healing ability. It can be fatal when poison is involved since the flame also speeds up the effect of the poison, but that's not directly related to cons of Sun flame use.
However, understanding the mechanisms of the flames means that Kyouya does not trust any kind of flame user to heal him, because their concentration could waver or they might not have strong enough flames and quite frankly they haven't gone through years of medical training like professional nurses and doctors do.
Therefore, Tsunayoshi Sawada has no footing to stand on in this argument.
"You've been shot!" Tsuna cries, throwing his arms out. "Five times! Just lets us help you!"
The rest of the Guardians stand in a circle on the destroyed forest clearing, hundreds of kilometres from any hospital, trying to get closer to the man who was currently dyed a deep, blood red. They have no idea how he's still standing without the slightest hint of pain in his expression, but it would be a lot easier if he just collapsed unconscious.
In the background, the six highly weaponised helicopters burn merrily, explosions occurring at irregular intervals. The personnel that were inside the helicopters are laid out at the bases of trees, most unconscious, with Reborn standing over them threateningly.
Kyouya raises an eyebrow, his torso bleeding profusely along with his left arm since he had blocked a highly pregnant Chrome from machine guns. "If you get anywhere near me with your pseudo-medical training, I'll bite you to death," Kyouya promises.
Tsuna narrows his eyes. "Pin him down," he orders.
They lunge for Kyouya but he's ready to meet them. After ten minutes of the Guardians being beaten up by the Cloud, Reborn has to shoot Kyouya to take him down.
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A/N: So, who else really likes the mechanics of flame abilities? *raises hand*
Sorry, Chrome. You're suddenly pregnant for this because if it was any other situation, Kyouya would have just kicked you out of the way like he does with everyone.