(Rainbow Dash performs a Sonic Rainboom and saves Rarity)
DM: So, all in all... the laws of physics are dead and Rainbow Dash murdered them.
Pinkie Pie: Yep!
Laws were made to be broken. Physics are no exception. Heck, you think wings of that size should really be able to lift their body weight? Or a horn should allow Twilight to teleport instantaneously across a room? Physics are their B!7€#.
Or to quote my favorite anime viewer about Gurren Lagann: "Deus ex machina? You're SWIMMING in it! You're swimming in it in SPACE, because Physics? F*** YOUR PHYSICS!"
Laws can be rewritten as an alternative to breaking them, though. 'Magic' doesn't need to mean 'deus ex machina', it could mean just a new 'branch' of physics, the way electricity and such has become.
With how analytical and science-y that Twilight is, and how magic permeates the entire world, it wouldn't surprise me that Magic can be seen as a sort of Science that, despite sometimes casual violation of the rest of the laws of Science, still has its own rules and laws it must follow... and Dash's rainboom? That's totally pegasus brand Magic going on and casually violating the laws of motion, friction, and gravity.
I tend to look at it the other way around: Twilight would have studied the exact nature of magic if it WAS precise, yes.
But with how cartoonish and hand-waving the writers tend to be, I expect 'Magic' to change from episode to episode, as the plot demands it.
Obviously Pegasi fly using magic, though, yes.
Just like Earth Ponies have that 'grow plants in an instant' power we've seen a few times, and Party Ponies can bend/break reality (though this later group overlaps into Narrative Causality - They can bend reality not just because they're magical, but because their role in the show isn't as serious, so the laws of nature aren't as serious either)
When Starlight looked like she was going to start expositing at length about it during yesterday's second episode ("All Bottled Up"), I actually found myself hoping out loud that they *wouldn't* try to explain the mechanics of how unicorn magic works... I guess because I don't trust them to come up with a scheme that's good, interesting, and consistent. I'd rather leave it open to speculation.
Hell, this was the entire crux of the original Pinkie Sense episode--Twilight being frustrated that Pinkie's precog talent didn't follow the 'laws' of magic-as-such.
The laws of physics don't count as innocent bystanders in this case. They were trying their best to make this feat impossible, so Rainbow killing them counts as "overcoming a challenge" and is worth XP.
The catch is figuring out the CR of the laws of physics. We may have to settle for awarding an ad hoc amount of "story XP".
Bitch, please! Was she a dwarf trying to fly by waving her hands really fast? No, RB was doing not only a thing he is proficient at, you can say she was doing something tied in with her natural talent.
Newbie, I think you should write a letter to princess Celestia.
I suppose that could be a way to get back at them. But I kinda doubt we'll see "The Return of Harmony" depicted in this comic. Too reliant on brainwashing.
GMs only complain about breaking the laws of physics when it's the players doing it. Meanwhile modules and homebrew adventures have all sorts of handwavium to keep your characters from using magic/technology/whatever to bypass a certain obstacle and solve the ridiculous puzzle the creator put in and thinks he's so clever and is irked no one wants to deal with.
Point is: the GM here invented a world of magical, talking ponies. He/she doesn't get to complain about violating physics. That's called "hypocrisy".
In this case, it might not even be breaking them. Terminal velocity is the maximum unpowered falling speed - if you took a JATO and pointed it downwards (which is probably the technological equivalent of what RD is doing here) you're going to descend quite a bit more rapidly than terminal velocity.
It's less "breaking the laws of physics" and more "ignoring the consequences of breaking them," which leads to breaking more and more laws until you've committed physicide.
Superman may be immune to all physical laws, for example, but Lois Lane isn't. If he catches her two feet from hitting the pavement after a ten-story fall, she is still going to die (or his invulnerable fingers will tear through her, which amounts to the same thing).
All ponies who were not Rainbow Dash could easily be killed by her rescue, even if she survives carrying it out. Luckily, ponies are inherently magical creatures, and unbeknownst to all save Pinkie, they also live in an animated universe.
That kind of reminds me of a discussion a player in my group had with the GM when we encountered a "minor death". In that system, it's basically an aspect of Death that is tasked with bringing the dead to their afterlife, depending on faith. The dialog ensued as follows.
DM: "So, thanks to the true seeing spell, you can see the Death coming for Elmirus."
Witch: "Can we kill it?"
DM: "No. It's Death."
Witch: "Yeah, but we can attack it now that we can see it, right."
DM: "Well, technically, you could, but it doesn't even have hitpoints. It's Death."
Witch: "Oh, okay! I cast a minor heal on it."
DM: "WHAT?"
Witch: "It'll have hit points if I heal it. So I cast heal, and -then- we kill it."
Much discussion ensued.
Just in case people come by Tuesday and there's no new comic: I've been having trouble with my ComicFury account, and I haven't been able to upload new comics. I'm still working on solving the problem.