The teleport was over in an instant. Thanks to Twilight's quick action none of Celestia's guards were inside the rune at the time of the teleport, but there was no way of knowing how many were caught in the explosion after they were gone. Aside from the severe disorientation common to any kind of long range teleportation, they were all unharmed, even Silver Wing.
All five of them shook themselves out of the daze with a fair degree of urgency. Silver and Swift were both familiar with teleportation runes and were somewhat accustomed to the side effects, and Twilight’s experience with teleportation spells included a few occasional long distance teleports.
Still slightly dazed, Fluttershy asked, “What do we do now, will the plan still work?”
“No,” Twilight replied, “We might be able to convince her that I'm not a vampire or a changeling, but after she attacked us if she finds me unharmed she'll suspect that I'm collaborating with them willingly. The plan might work, but only for so long. No, we need to leave.”
“Leave?” Rainbow asked in disbelief, “Twilight, Ponyville is our home. We can't just leave.”
“Twilight's right, there's no way the plan we came up with can work for long,” Swift Wind added. “Even if Twilight can shake their immediate suspicions, she would be caught eventually. After that it's only a matter of time before everypony close to her falls under suspicion as well. You can either leave now or wait here until you forced to choose between running away or dying.”
Once she understood their position, Rainbow grew quiet, even though she really didn’t want to. Twilight was right, there was no way they could stay forever.
Taking Rainbow's silence as a sign of defeat, she said, “We don't have a lot of time then. Celestia will be here soon and I want all of us out of Ponyville by the time she gets here. Get anything important to you and be back here as soon as possible. You have about ten minutes at the most, but that's pushing it a bit, try to be back sooner if you can.
“Swift, go with Fluttershy. In her house, there's a cabinet protected by runes. Get rid of the runes and take the lock with you, and bring the contents with you. Silver Wing, you’re with me.”
-----
After Twilight left, Spike crawled into his basket and desperately tried to fall asleep. Even as he tried though, his mind kept him awake, wandering to Twilight and what might have happened to her. A threat of murder was no small thing, and whoever asked him to send that letter to Celestia obviously had more in mind than simply sending a massage, and they intended to use Twilight's safety to get what they wanted.
When Spike heard ponies moving around downstairs, he first assumed the worst, that Princess Celestia was there to deliver some horrible news about Twilight, about what had happened to her.
To his surprise, Twilight and Silver Wing came in just a few seconds later.
“Get Lunar Pearl, I'll get the box,” Twilight said with urgency. She used her magic to retrieve a book that she left under her pillow and return it the box with the others.
“Twilight, what's going on?” Spike asked.
Silver Wing gently shook Lunar Pearl awake and picked her up. She let Lunar Pearl climb up on her back on her back and went to wait by the door for Twilight.
“I'm sorry Spike, but there isn't time for me to explain right now,” Twilight said. “Celestia will explain everything you need to know once she gets here, but right now we have to go.”
She used her magic to teleport the box outside, where she could retrieve it on the way to rejoin the others and hide it somewhere in the Everfree, maybe bury it somewhere to collect later on, once they had a better idea of where they would go from there..
“But Twilight, where are you going?”
Twilight smiled. “Don't worry Spike, I'll be alright. Maybe we'll see each other again someday. I’ll miss you.”
Before Spike could say anything else, she rushed out the door and Silver followed close behind her. All alone, Spike curled up in his basket again and kept going over Twilight's last words as he waited for somepony else to come along, to explain what exactlys had happened that night.