I'm wondering these days if someone wer to cast a lightning spel in doors would it just use charges that are already in the room such as appliances. Although, saying that I think if someone were to discover something like Hogwarts they say it makes our equipment go a bit haywire, so, how could lightning and thigns be justified in an indor environment?

I feel like this should be in off-topic...

As far as Alter Aeon's fly spell goes, here's the help file.

The 'fly' spell allows you to float above the ground. In this manner
you can travel across water and even glide for short distances in instances
where you would normally fall.  Fly also reduces the amount of movement you
use as you travel.  This spell can be cast on objects to make them float.

In detail, it creates a transparent magical bubble beneath your feet, lifting
you off the ground.  Because the bubble is anchored to your feet you'll get
better traction, and being off the ground allows you to avoid many tripping
hazards and generally make better time when traveling.

This spell also allows you to walk on water - the force bubble displaces the
water beneath you, and can hold even the heaviest spellcasters.

If there is no ground present, it seems like one should fall.  Oddly enough,
it seems that this is not the case.  If ground is nearby the caster will
fall.  However if the ground is sufficiently far away, the spell allows you
to pretty much walk on air.

This strange behavior is one of the great unsolved mysteries of magic.
Prayers to Dentin for answers to this question result only in feelings
of amusement, and researchers analyzing the spell have noted that it uses
a unique spellword, the purpose of which is not at all understood.  Further,
that spellword is the only known spellword that is found in the second,
extremely advanced half of the A-layer texts, placing it well beyond our
current understanding of how magic works.

'Levitation' typically refers the enchantment derived from this spell that
can make objects float permanently.

So according to that, it doesn't actually harden the air. It somehow creates some sort of bubble that's strong enough to hold someone, yet can allow them to float. How exactly that bubble is formed and what it's even made of is the part science would have to figure out.

I don't know, the fly example doesn't seem consistant from when I played last.  If I remember right, certain field penalties still apply, especially the dreaded swamp environments.  However, with the water example there, it displaces the water away so one can walk better over water...  So why not swamp environments as well?  IN fact, wouldn't it be easier to make someone walk in a swamp with levitation rather than the ocean? 

     I sort of like Lost Souls implementation of magic.  Especially the magi guilds, who tend to have histories, and casting processes that generally explains what you do with certain energies to eventually end up with a certain affect with a spell.  However, this extends outside of the magi guilds, but information on how stuff like empathic charm magic tends to work is less accessible to the playerbase, but still referenced by builders to keep empathic bonds consistant in design.

I don't quite remember oceans always being flat to maintain a bubble atop fairly well.  Though I guess the way to portray this when walking on an ocean is step, step step, oh dear god that wave took out my mv.  Though that does clear up the exact bubble usage for swamp territories being so mv draining even when above the obstacles.  Guess hovering above the ground is too advanced for us mortal plebs.  Practicing to become Rosco, the Russian circus bear running atop it's magical ball is the way of travel  ( i know it's not like that, but for some reason walking atop a force bubble put a picture of a circus bear to my mind).

    Though I mean, looking at the game skills itself, I'm just going to assume the levitation spell works like that to avoid deprecating the navigation skills if one could just float over everything without contact.  My memory is faulty but I'm 99% sure that help file was something totally different from what it originally was.  but I mean, there's nothing wrong with organizing through old help files, and establishing a common lore behind all the abilities a player has access to,.  Especially if mechanics change over the years and some of this stuff becomes warranted. 

    ...Probably an alternative topic to scientific workings of magic systems, having a historical context is just as important, and honestly gives the explanations a point a reference to start off.  There's oddly a lot of games where not even the origins of the spell are described, let alone how it works.  What experiments were done to turn a dart of flame into an exploding fireball.  How many puppies were burnt to eventually bring up the fires of hell in a prayer?  Why did anyone think magic missile was a good idea?

    I see some popular games, especially the rp oriented ones, introducing new things into the game with experiments by players, whether through a long series of monitored rp to establish a new spell, or the knowledge being passed down after an epic quest.  I Know Altar Aeon does this with stuff released during events, along with one event ago in Materia Magica, and another set on Tempest Seasons.

About the fly spell in alter, remember that this spell requires to master magic misil/force shield in order to be casted, so it's clearly a partially stable buble of energy that you form bellow your feat. Basically it looks like this is the same energy, just used in a subtiler way.
It could explain, along with the irregularity of the swampy ground, why the fly spelle doesn't reduce the movement  consumption in swampland. Actually even the forcefield created with a shielding spell is not absolutly reliable. Some projectiles or strikes will pass through it, otherwise it would simply be an invincibility spell.
Also if you remember, the fly spell can prevent you from being tripped up, but not with a 100 percent probability. So we can assume that, if the terrain is irregular enough, some obstacle will disturb the buble, forcing you to act physically and, therefor, to spend movement.

About justification of magic, no mather the room in which it's launched, the discussion is pretty interresting. Actually every discussion concerning lore and world background i games /fictions looks really attractive to me.
You were mentionning Brandon Sanderson, and you're right. Magic justification is quite well built in the mistborn saga. But it sometimes tends to be a justification for the storyline itself, which is a danger for the universe's realism.
In a totally different way, discworld does have a pretty good magic system. It's mostly absurde of cours,e but you can find justifications for the physical impact and source of magic, as well as a kind of scientifical justification for reality's alteration while casting spells. Discworld mud uses these concepts with brilliant creation and background building skills if you want my opinion.
ON the contrary, let me ask you on equestoni to conclude. Harry Potter  : if magic is really what it is in this universe, if casting a spell is so easy and if it only requires a little practice and knowledge of an inquentation, can you explain why Voldemort and Grindelwald were the only one in Europe to try to start a revolution. I mean, considering human's nature, such a power should be under control, and not only under constant observation with eventual sanction. We're talking about a magic that can, without any energy cost, burn buildings, kill, destroy bridges and even an entiere city if one has the power to try to do so. And forget about justification of magic in Hp's universe, there are mostly two or three rules that put some kind of limits to its use, but for the most part it's simply... well.. magic

Best regard,
Simon