"Well, that was strange," Papyrus murmured.
"You can say THAT again," Sans chuckled, walking down the East Hall. Their footsteps made clicking on the floor. There were tiny blood puddles dotted around on the floor. Sans had a flashback about Chara, stabbing Toriel in the stomach. He gasped and got himself ready for combat.
"What are you doing here?" asked a voice in the shadows. It sounded familiar.
"Dunno," replied Sans.
The shadow appeared to come out of the wall. It covered up their mouths and Sans and Papyrus blacked out.

Sans woke up first, tied to a chair in a dark room. The light flickered on and off repeatedly, as if the room had been their for 30 years.
"Psst! Papyrus, wake up!" Sans whispered. Papyus opened his eyes.
"Sans? What happened?" Papyrus asked quietly.
"I don't know," Sans sighed. The shadow came back from out of the walls. It was a tall figure that looked like a golden, broken version of Bonnie. Papyrus had seen these mechanisms before, Undyne told him about them. They were springlock mechanisms, with springs inside and stuff, according to Undyne. Undyne had got that knowledge from Alphys. Alphys didn't work with robots that much, and the only robot she'd built was the 'Determination Extractor'.
"Look who finally decided to wake up..." the figure said manically. "Oh, I forgot to intoduce myself. I'm Springtrap. Some people call me Spring Bonnie or Golden Bonnie, but just call me Springtrap." After that long introduction to 'Springtrap', Sans noticed something. A dead body stuffed inside Springtrap. The body had a purple hat on... weird.

"You seem pleasant," Sans chuckled sarchastically.
"Heh, thanks. Not many people..."
"I was being sarchastic," Sans said, kicking Springtrap in the knee. Sans bit into the rope and levitated Springtrap into the corner.
"You won't get away with this," yelled Springtrap as Sans cut Papyrus' rope.
"I was hoping somebody would say that because it wil make me feel better when I do," Sans mocked, running out of the room with Papyrus.