HISHE  
@Tenafly Viper  

 
She has plenty.
 
 
@DashForever  

 
Nope. It was a total waste of a great character.
 
@Background Pony #B835  

 
Because it was an accident and Rainbow created the tornado too.
 
@ArrJaySketch  

 
And years later there still is no trace of Lightning Dust.

@Background Pony #B835  
In hindsight….

Well, this most certainly explains why Lightning Dust would come to Ponyville’s defense in the comics and why she and Dash are apparently hanging out in the Fluttershy book (based on what I’ve seen on TvTropes, please do correct me if I am mistaken). Both endings are good in their own right, but this one explains those two things.
 
Just one thing bothers me…
 
Why the heck would Rainbow Dash drop Gilda as a friend, but give Lightning Dust another shot so easily? Gilda was a jerk to Dash’s other friends, but I do not recall her doing something that could result in their deaths! Perhaps this is why the scene was cut…

Both endings are good in their own right.  
The aired ending left it up to the viewer to determine if LD learned her lesson or not, like “The Lady and the Tiger”.  
The tweeted ending redeems LD on the spot.

@ArrJaySketch  
Indeed, including a bitchin’ sweet revenge plot.

I liked the ending as it was shown. It leaves a lot open for the future.

I think the original ending is much better, and leaves room for best antagonist to come back.

@Beau Skunky  
Trixie was redeemed enough that I doubt she still harbors enough resentment to return as a villain.

@Zennistrad  
@Tenafly Viper  
Have Lightening Dust, and Trixie team-up, I say. Now we just need an “earth pony” minor-antagonist.

The original ending is better. Lightning Dust does not seem responsible enough to turn around that fast. Also, her character has no redeeming traits.

I actually liked the original ending better because it gave Lightning Dust a reason to return sometime in the future (namely, a grudge against Rainbow Dash).

Why the FUCK didn’t they use this?!

well…. headcanon accepted

@And Brother I Hurt People  
Even if it’s “old” I never saw it personally, so some of us actually missed out on some of these Twitter posts, as we don’t use Twitter much.
 
I suppose that would’ve been a slightly better ending to show Lightening Dust be a good sport about it.

Was there Serioulsy nothing that could have been left out to put this in?

Old as dirt.
 
Still, they should have used this ending.

Don’t we have this already? This is old news anyways.

Wasn’t this already mentioned, like 10 or so days after the episode aired?