Time and Teleportation... Twilight has bent time and mastered teleportation but at what costs!? When Twilight used a spell to go back in time to stop herself from stressing she created at time loop. A time loop is an infinitely repeating moment in time that can not change. Even though she progresses through time normally a skewed version of the average timeline still exists. If she were to time travel again, she would make a second time loop and open a third time stream.

In Twilight's case of teleportation...this is harder to explain. In many theories of Twilight's teleportation, she theoretically dies. In one theory, Twilight is broken down into her individual atoms and reassembled a moment later. She would die the moment she went into teleportation because even if all of the pieces are together they ultimately ceased function when separated.

So basically Twilight broke time and killed herself many times over...that takes skill...