Sans waited in the kitchen, where Frisk had lead them. He was confused, to say the least. He had woken up that day, with the vague memory of a striking amount of pain in his chest, and the scarf of his brother. He figured it was just another nightmare he had, but this one was different. He didn't remember holding the scarf, nor wearing it. It was wrapped around him, like a makeshift bandage. He'd never seen that in one of his nightmares before-

Sans was cut off from that thought as Frisk and Toriel walked through the door. He stood up, and looked Toriel in the eye. "sorry, i guess this isn't that cheerful of a meeting." He said, holding his hand out. Toriel shook it, and the sound of a whoopee cushion came out. "ha. still got it." He laughed, putting his hand back into his pocket.

"So, what is this about your brother?" Toriel asked, her head tilted in confusion. Sans sighed, and his eyes went dark.

"something's wrong with him. He's… killing. i know my brother, and he would never kill." Sans explained to the two standing in front of him. Frisk gasped, and looked to the toy knife in their pocket. "no, kid. i don't think this is your fault. i think there's something wrong with the timeline.." He trailed off, as his phone began to ring. He took it out, and put it on speaker phone. It was Alphys.

"S-Sans! There's something wrong with Papyrus! H-He… He killed Undyne! Please, get here quick!" She seemed very distraught in her shouting, but suddenly the sound of the phone dropping rang out through the speaker. It hung up.

Sans, Frisk, and Toriel stood there speechless. It wasn't a case of mistaken identity, it was for real. His brother was killing, and he had taken the life of his own best friend.

He had to stop him.

Papyrus trudged along the path to the Core, Flowey popping up beside him every now and again. He hadn't run into anyone lately, which made him very upset. He needed to get to a high enough LOVE to kill Asgore. He carried a piece of Undyne's armor in his hand, as a trophy. He figured it would catch Asgore off guard, giving him the chance to strike. He shook it, it still had some of her dust on it. Suddenly, he noticed he had walked onto the set of a TV show. It was one very familiar to him. His favorite show.

Mettaton rolled out from the other side of the set. He seemed very angry, as angry as a metal box could seem. "Well well well." He spat. "Look who we have here? A traitor." He stopped a few feet in front of Papyrus. "You're still alive. That means Undyne failed…" He trailed off, reaching under the counter for something. "...Now, that won't do, will it-" He was cut off by the flipping of a switch on his back. Papyrus looked at Flowey, who had just pressed the switch.

"There we go, that was getting a bit boring!" Flowey laughed. The two watched as Mettaton's boxy form started to transform into that of a tall robot. Papyrus couldn't help but think that his legs were amazing. "Get going, you idiot!" Flowey shouted at him. "Kill him while he's vulnerable!"

Papyrus charged at Mettaton, spawning a large bone pointed at one end. Mettaton was still transforming, it seemed his form was not complete yet. Papyrus raised the bone and impaled it through the robot's metallic head. For some strange reason, he felt a slight sadness when he did it. He shook his head, as the robot's dust began spreading around him. He looked at Flowey, and the two nodded. He checked his LV.

Papyrus

LV 18.

He just had 2 LV to go. He DEFINITELY couldn't go back now. Flowey glanced at him, and popped back under the ground. Papyrus glanced back at the piece of armor, and shook his head. He didn't need that to catch Asgore off guard. He could very well do that on his own. He kept walking. He had to keep walking.

Papyrus finally reached what he was looking for, a force field holding him in on that floor. It was originally to protect the evacuated monsters from him, but now it served as a trap to keep him there. Flowey shot out of the ground on the other side, and he deactivated it with his vines.

They both kept going until they reached the elevator. Papyrus walked in, and Flowey went ahead to the next floor. All of the floors were available, so he chose the area next to the MTT restaurant. He stood while the elevator rose. It was just him, and his thoughts, for those long ten seconds. ..What if he was wrong? What if he had just killed, for no reason? ...What if he was the one he was protecting his brother from-

He was cut off as the doors opened. He turned the corner to where the Nice Creams are usually sold. Nobody was there. "Oh. Right." Papyrus muttered, he remembered having killed him in the crowd. The rabbit seemed to be trying to protect another rabbit, but ended up getting both of them killed in the process. Papyrus began climbing the stairs to the restaurant. All of the lights were off, except for one? He walked into the building, and saw the lights were coming from the place where his brother bought a Legendary Hero once. Papyrus passed by the shop, and walked into the CORE.

Suddenly, he was ambushed by two mercenaries. Papyrus stared at the mercenaries. It was his turn to attack, so he killed both of them with a single hit. Three more showed up when he reached the maze. He decided to just blast them. His LV grew a single point. Just one more to go. One more kill, and he'd be at the max he could get to in the Underground..

What would he do then? He hadn't seen the human since his brother was killed.

...Was the human even still alive? He didn't know, but he had to keep going.