Immediately, she had to put that to use.. She was in an endless expanse of sky, as most dream skies were. The sun's final rays shone from behind the horizon, shedding the only light into the otherwise complete darkness.
The only sign of the dream's subject was a blazing trail of rainbow.
Immediately Luna took off, faster. She had held the title as the best flyer in equestria before her banishment, and thought she still did until she met Rainbow Dash. Even without the added magic that came from being an alicorn, Rainbow Dash was able to put all she possesed into her flying in a way she had hardly ever seen.
And she was doing it now, heading straight down.
Luna knew that she could ever hope to catch the pegasus, she was obviously chasing something. If Rainbow had her way, she would keep chasing until she woke up, her heart pounding and fearing for whoever was falling.
So she employed the one feat she could pull off that Rainbow, or anypony else, ever, could: Mid-Flight teleportation.
She folded her limbs in, but kept her wings out and going as fast as she could, and let her horn flare up. In the dream-like state that was mid-teleport, she held onto one thought: Keep flying.
With a pop she landed next to Rainbow, and she immediately struggled to keep up.
"Rainbow Dash! You must stop!" She screamed, the wind tearing her voice away.
Rainbow Dash flicked her eyes back to the Princess, then looked back ahead.
"Can't. Gotta… Gotta catch her."
"Who?" Luna asked.
Rainbow just ignored her, and Luna came to the only logical conclusion: Rainbow didn't know. These dreams were the worst, you could go and go and go and never get what you were after.
Luna grabbed the pegasus with her magic and brought them to aa cloud.
Rainbow kicked and struggled, and screamed at Luna.
"Let go of me! She'll die! Stop being a feathering idiot!"
Luna sat calmly, letting the pegasus wear herself out. When the yelling stopped and the struggles slowed, Luna spoke.
"Rainbow Dash, who were you chasing?"
"It doesn't matter, she's dead now."
Luna spread her wings to their full span, and utilized the tiniest bit of The Royal Canterlot Voice.
"Rainbow Dash. Who. Were. You. Chasing."
The pegasus dropped her head, and let er wings finally fold down by her sides. She crumbled a bit as she spoke.
"I… I don't know. Nopony, I guess."
Luna relaxed a bit, dropping back into a normal posture.
"Just as I suspected. Do you have this dream often?"
"They… They stated after the best young flyer competition. First it was Rarity. Then they went away for a while. Then, after that one camping trip, it was Scootaloo. Then after the incident with Lightning Dust, it was all my friends. Now it's just… I don't know. But I always know it's important."
Luna nodded.
"Rainbow Dash, when I was younger, had a pet turtle. He was an adorable thing, fairly small and green… But he loved to walk. One day we were out in the garden and he walked, and I followed him, but he walked right into the lake. I was afraid, I thought he had drowned! But my sister explained to me that little Terrapen could take care of himself. Do you see what I am trying to tell you?"
She turned to the pegasus who shook her head.
Luna sighed. "What I am trying to say is, though it felt like I couldn't rescue him, I could. I could levitate him out, or something. But he didn't need to be saved. You are a wonderful friend, and I'm sure if your friends needed saving, you could. But they are capable of handling themselves."
Rainbow nodded, slowly.
"So, I need to have more confidence, in myself and others?"
"Yes, I belive that would help."
With that, Rainbow cracked up.
"Who would have thought Rainbow Dash, the awesome-and-she-knows-it pegasus, would need more confidence!"
Luna broke into a nervous chuckle.
"Ahem, mainly in others, Rainbow."
"Yeah, I guess. Hay, I'm a faster flyer than you,what do I have to worry about?"
Luna stared straight into the pegasus's eyes, and unfurled her wings.
"It. Is. On."