What Twilight saw, was a changed Lyra. It seemed the Derp Note had long term side-effects. Her eyes were now extremely crossed, almost pointing directly at each other. She was also sweating, like she had a fever of sort. Twilight cast a quick diagnostic spell over Lyra, hoping to find a reasonable cause.
"Curious... I can't detect anything wrong with her," Twilight said, after receiving the results of the spell.
"Really?" asked Bonbon, "I wasn't letting any pony in because I was afraid it was contagious."
"That begs the question. Why did you remain?" Twilight asked, puzzled as to why Bonbon hadn't just called a doctor.
"Just because I don't like her, doesn't mean that I'd leave her here, on her own. And I didn't think any doctors would be able to help her."
"And why did you think that?"
"With her eyes like that, I doubted it was any natural disease. Do you know what might have caused this?" Bonbon asked, suddenly suspicious.
"Me? Oh, no idea in the slightest!" lied Twilight. Badly. She wasn't Applejack, but she wasn't very good at lying.
"Oh really?" inquired Bonbon, eyebrow raised.
"Really!" Twilight insisted. She realized Bonbon had probably seen through her lie.
"Uh-huh," Bonbon replied, eyebrow raised, even higher. The only way it could have gone higher, was for it to fly off of her head. This might have happened, but the universe was in no such mood.
"Well, I've got to go now. With any luck, I'll have Lyra cured soon," Twilight yelled as she ran quickly out the apartment. Bonbon was starting to scare her and remind her uncannily of Applejack. She didn't stop running until she reached her tree house, and even then, she only slowed down a little. She spent the rest of the day studying, looking up diseases, and coming up for a plan to deal with Ditzy Doo.
Bonbon, for her part, locked the door to the apartment. She then walked over to Lyra, and stroked her comfortingly with her hoof. "You know, I still don't like you that much. But I hate seeing you like this. And don't think for a second that I'd be talking to you like this if you were awake," she said, very quietly, afraid to wake up Lyra, who was, at this point, just snoring clearly asleep.
The next day started with a glorious sunrise, thanks to Princess Celestia. She was in a whimsical mood that day, and decided to start the day with a sunrise to reflect that.
Over at Ditzy's house, Ditzy woke up, and went about her morning routine accompanied by Xanderppe. This didn't bother her, as she managed to ignore him for the most part. Xanderppe just hovered around, waiting for Ditzy to finish. He wanted to get started on derping ponies. It was the only thing he really could do, and thus the most fun.
When Ditzy had finally finished, she walked out of her house, and flew toward the post office, with the Derp Note in her bag. Xanderppe followed, relieved at not having to be cooped up any longer. He was ready for some excitement.
When she reached the post office, there was a letter taped to the door, addressed to her. The return address was unusual as it was just the letter T. She took down the letter and headed inside to her work station to read it.
Dear Ditzella Esmeralda Doo,
I know what you are planning. I urge that you reconsider. The consequences of your actions are not to be taken lightly, and the repercussions of such actions will not be good. If you reconsider, put the Note next to the letter, and then let go of both. If you decide to continue in your foolish path of revenge, just let the letter go.
Signed, T.
"Ooo, intrigue!" Xanderppe remarked, reading over Ditzy's shoulder. "Your name is Ditzella? Why call yourself Ditzy?"
"Simple, really. Ditzella is too much of a mouthful. I'm surprised whoever wrote this letter knew my name, as I don't use it at all," Ditzy said. The universe would like to quickly state that it does agree with Ditzy here, and shall continue to call her that. "T, eh? If this T is really who I think it is, she's clearly not as smart as she thinks she is," Ditzy thought to herself, as she let the letter go. It drifted on a breeze, which hadn't been there earlier, then burst into green flames, and disappeared. Ditzy didn't notice any ashes, so she surmised that it had returned to whomever had stuck it to the door.
"You're in early," said her boss, walking past her. His penchant for stating the obvious was one that annoyed those around him. Ditzy was no exception. He walked over to his desk and took a seat. "Well, what are you waiting for? Start sorting," he said to Ditzy, and gestured at the pile of letters on her desk.
"Yes, sir," she said, careful not to let her annoyance seep into her voice. She picked up a letter, read who it was addressed to, and put it into a pile. This continued for a while, until she reached the last letter. It was addressed to Twilight. Ditzy found this odd, due to the fact if any pony wanted to send a letter to Twilight, they could just send it via Dragon's Fire. She shrugged, picked up all the letters, with Twilight's at the top, and headed out, Xanderppe not far behind. Any excuse to visit Twilight was enough for Ditzy.
Twilight was awoken by the sound of knocking on her door. She had spent a large portion of the previous night studying, and formulating a plan. She ended up falling asleep at her desk. She rose with a start, several papers following her, one stuck onto her cheek. "Hold on! I'll be there in a minute!" she yelled at whoever had knocked at the door.
She pulled off the paper, ran into the bathroom to make sure she was presentable- she was -and ran back to the door. She opened it and was faced with a rather gray sight. That is to say, Ditzy Doo, with the letter for her. Twilight took a quick step back, unsure as to why Ditzy was there, and voiced her confusion thusly, "Why are you here?"
"You of all ponies should know why," came the reply.
"As cliched as this response is, I have absolutely no idea what you're talking about," Twilight responded, truly confused.
"You really expect me to believe that? I mean, really?" Ditzy asked, offended by the notion. For his part, Xanderppe just shrugged, and thought of muffins.
"I honestly do. I really have no idea what you are talking about."
"Uh-huh," said Ditzy, eyebrow raised. This caused Twilight to take an inadvertent step back, due to the similarities to Bonbon and by continuation, Applejack. "So, you're telling me that a letter signed T, which has no return address, which openly references the Derp Note, and which disappeared in a burst of green fire, which, coincidentally, is the exact same color as your dragon's.... ISN'T from you?" Ditzy continued, starting to get really annoyed.
Twilight blinked for a few moments, at the sheer coincidence of all these things happening. "That... does sound like something I'd do, I'll admit. But you have to believe me, I played no part in this."
Ditzy just stared at her for a few minutes. "You know what? I'm going to have to believe you. No pony as smart as you would be stupid enough to tell such a blatant lie like that. And you don't seem like a good enough liar, honestly. But if it wasn't you... who else could it be?" she asked, not exactly trusting Twilight.
"I'm flattered," deadpanned Twilight, "as to who it could be, I don't know. I'm the only one who knows of your note, unless you want to suggest that there is another Note out there."
"Working off that assumption, how would you tell?" Ditzy asked, curious.
"Well, I'd need your Note. I would scan it for its unique signature, and then search for it elsewhere. So, can you hand it over?"
"Okay..." said Ditzy, wearily. She handed it over to Twilight, who took it from her.
"Thank yoUUUUUUUUUUUUUUUUUUUU!!!" Twilight screamed in fear, soon devolving into a shrill shriek of fright. Ditzy took it upon herself to slap Twilight. "Thank you. I needed that. Now... What in Starswirl's Beard is THAT?!" she asked, pointing to Xanderppe.
A voice drafted into Ditzy's head, "Apparently, those who touch the Derp Note can see me."
Ditzy muttered, "A little late on that, aren't you?" then said out loud, "That is Xanderppe. He's a... Derpigami."
"A what?"
"A Derpigami. If he's to be trusted, that means he's a god of Derp."
"I'll go into why that's scientifically impossible later, Ditzy. For now," Twilight started, as she cast a spell, "I'll see if there are any more Derp Notes." Several seconds past. Then a minute. Then another. Finally, an exhausted Twilight said, "Well, I can be pretty sure that there are no other Derp Notes in a large radius."
"How large, exactly? And why did it take you so long?" Ditzy inquired.
"I... honestly don't know. I cast the spell as long as I could until I had to stop. I can safely say that there are no other Derp Notes in Ponyville, or any of the surrounding areas."
"I see. So, what other possible explanation is there?"
"Hm... why, that's it!" yelled Twilight, bolting to her door, quickly casting a spell.
"That's what?" asked Ditzy, a look of confusion on her face, increased by a sudden derpage in her eyes.
"Why, it's the only possible explanation for what's going on. Ah ha!" exclaimed a triumphant Twilight.
"Ah ha, WHAT?!" asked Ditzy, wishing Twilight would just explain.
"Ah ha, this!" Twilight said, levitating a small, silver-blue hair in front of Ditzy, "And that's not all. I have a security spell cast over my door, which registers whoever passes through it. And guess what? It registered an unknown pony last night! I must have fallen asleep when they entered. They probably looked over my research on the Derp Note, and decided to post that letter," Twilight explained.
"But... why?" Ditzy asked
"It's simple, really. Whoever put that letter there must really dislike the whole concept of you Derping ponies. More than I, anyway. And for what it matters, I have a good idea as to who it could be. One question though. Did the letter look like it was written by horn?"
"Yes, it did. It looked far too fancy to have been written by mouth," replied Ditzy.
"Perfect! Then that means it's almost certainly her," said Twilight, to a confused Ditzy.
"Who?" asked Ditzy.
"Oh... Um. I'll explain to you later, OK?" a nervous Twilight asked.
"Sure..." Ditzy trailed off, a sudden realization striking her, "Hold on. If we are going to chase after whoever did this, there's one thing I need to do first."
"What?" Twilight wondered, not thinking of anything Ditzy needed to do.
"This," Ditzy sheepishly gestured to her mailbag, brimming with letters.
"Oh. Well, once you are done then, we shall depart!" Twilight exclaimed, letting the excitement get to her a bit too much.
After hearing this, Ditzy slung the mailbag over her shoulder, and departed.
A while later, and Ditzy was half-way done. She was still pondering helping Twilight, and was discussing it with Xanderppe, "I'm just not sure if I should or not. It all boils down to how much I trust her, really."
"If it's that much of a problem, why even talk to her for as long as you did?" Xanderppe asked.
"Well, I wanted to know! Any pony who would threaten me must know about the Note, and I wanted to know who that was."
"If you say so," said Xanderppe, wondering why Ditzy would even attempt lying, knowing he could read her thoughts. Whilst they were conversing, Ditzy was delivering mail. She slipped into her thoughts whenever any pony approached her, to make sure it didn't look like she was talking to herself.
A short time later, she was finally done. She flew back over to Twilight's library, and knocked on the door. She was greeted by a sight of sheer white caused by all the papers which were stacked up against the door, no doubt. Ditzy waded through the papers, and accosted an amused Twilight, "What are all those papers doing here?"
"Oh, I just had to do a bit more research," she sheepishly stated.
"On what, exactly?"
"Oh, just a small matter. With any luck we won't need to worry about it!"
"Uh-huh," said a disbelieving Ditzy, "So, are we going?"
"Yes, yes! I sent Spike out on some errands, so I don't need to worry about him. I certainly don't want him to be in any danger," said Twilight, as they started off. A little while later they stopped in front of a wagon. Twilight walked up the steps, and knocked on the door.