Well, there are two ways this problem can be answered. The first is that it's magic so it won't do this stuff to the user. The second is that the user needs to have mastered plasmamancy enough to protect themselves from these effects. For simplicity's sake, I'm gonna go with the first way of answering.
He is saying in DBZ. Your pretending DBZ is possible in real life. He is saying all those effects would happen to the fighters in a realistic setting
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It's less about the utility of RL weaponised plasma and more about the physics of plasma themselves. I just wanted to point out that it's not 100% law-breaking and that it does adhere to at least a few natural laws.
It is 100% physics breaking and doesn't adhere to any natural laws....
The gods know that magic is sourced from ambient energy (presumably from their experience with creating schools) and they could've just told mortals how they worked. As for the paragraph before that, I was just suggesting ways that magiteknology could go in the future. Sure the average Joe wouldn't figure it out but a master who's studied it for long enough to understand what it is would. As for how they'd figure it out: magic. Either plasmamancy on its own or with some libromancy to assist.
Maybe, but do you know what magic really is? What is this ambient energy? Where does it come from? Why does it work the way it does? What are the hidden schools? Your God doesn't know much about it in the end. And neither would they. No, you where not. You literally said "Semi-soon", like "Oh, maybe a couple of ticks!". That isn't in the future. They don't know how it works now (And you implied they did), and as KJP said they are more likely to not look into it any more, actively hindering rather than helping.
By that logic, the only way anyone can be a proper pyromancer or electromancer is if they have the Fireproof trait. I highly doubt that the trait is necessary to use fire magic.
How so? You can shoot a fireball without getting near it. If you sustain a flame for long enough to melt metal in a controlled way, while staying whiten several feet of that burning plasma the entire time, you are gonna burn to death if you don't resist heat. Plus, if you can resist heat, you can just dip it in magma or something. A fire-mage setting himself on fire isn't going to walk around like nothing is happening.