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^That was with the element it doesn’t count.
@Cgeta  
19:15  
I don’t think Twilight could have walked up there.
Scrabbleman
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The End wasn't The End - Found a new home after the great exodus of 2012

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The same reason why a fly would be dumb enough to come close to me so I can kill it.
Background Pony #9F1A
The same reason a deer doesn’t move out of the way before getting hit by a car.
Background Pony #9F1A
Magic takes concentration. She wasn’t thinking clearly at that time.
Because, in D&D , Twilight is the textbook definition of a wizard with high intelligence and low wisdom.
Background Pony #D636
Panic. Hard to think clearly with a giant four headed monster chasing you.
I’m also going to vote for the stress theory. Teleportation takes a lot of concentration AND energy. And if Twi can’t have either she can’t do it. Except when she goes nuts. Going nuts just unhinges every hidden magical ability she has without the control she has when sober.
Because despite being incredibly book smart, Twilight is still kind of an idiot when it comes to everything else.
Background Pony #8A94
You may be able to do something usually, but that doesn’t mean you’ll be able to do it, simply.  
Some days you can lift a certain weight, other days, you can’t.
What Cgeta said is pretty much the rules for G1 teleportation.
I just think her ability to teleport is based on fer focus and mainly calmness. When calm her teleporting in perfect like during applebuck season or the season3 song but whilst panicing she messes up like in dragon quest
Option A: Unicorns have a more difficult time using magic if they are frightened, nervous, or otherwise under stress.
 
Option B: Twilight is kind of a an idiot when it comes to ing that she can use magic.
Simple. Because hums the MST3K Theme
froggy bottom swamp is an area of magical interferance, like the everfree forest.
Because, despite how smart she saids she is, Twilight isn’t very bright.
Prof.NightJack
Equality - In our state, we do not stand out.
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Gizmonics Scientist
@ALIS  
QUIET YOU! (teleports him to Mars)
V nah she was less nervous then when with Nightmare Moon.
Prof.NightJack
Equality - In our state, we do not stand out.
The End wasn't The End - Found a new home after the great exodus of 2012

Gizmonics Scientist
You have to be clam to teleport properly, if she tried it when scared she may have ending up in the hydra’s belly, you think a teleport around with magic when something goes wrong im my lab, nope that’s why I made a teleporter device.
Background Pony #36BE
She was out of MP?
Too nervous to focus into casting a spell…
V she used it the first time fighting Nightmare Moon.
 
The real reason is because a Teleport = Sonic Screwdriver.
NoWayOut
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Commenting intensifies
because she had not mastered it yet. If you look to the Story Twilight must be new in Ponyville becaue she not really know Pinkie.  
She uses the Spell first with a huge Effort while she tries to escape the Ponys who want her Galatickets. Here Twilight seems to be in Ponyville longer.
 
Even if the Episode with the hydra came out earlier it have to be behind the Episode with the tickets because of the Storyline.
She was too unfocused.
By teleporting she can only reach places she would be able to walk to. For example, she is also unable to teleport behind locked doors.
 
Her ability to teleport is only used as increased traveling speed.