Using her awesome newfound rainbow power, Twilight Sparkle simply blasted Tirek into oblivion from where she stood, half a world away.
The distance didn't matter. This power was incredible, nearly unlimited. Tirek exploded into tiny shards that fizzled away under the rainbow's intense glow. His gathered magic, now freed from him, returned to the ponies he'd taken it from.
What next? She should bring Discord in to talk about his betrayal, but first she'd need a suitable place to do so. With this kind of power, it would be easy. She blasted the ground near Ponyville, building herself a bigger and better library/castle. That would do it. Nice. Her shelves at the library had been getting a little full. Now she'd have plenty of room.
With a casual flick of the power, she teleported there and teleported Discord in front of her. "Now, Discord, I think we have a few things to talk about."