My time is almost up. I've almost killed every monster in the underground. The human should fall into the hole in an hour or two. I still have yet to kill Undyne, Napstaton, some monsters in the lab, and Queen Toriel- no- scratch that. I don't think I can kill the Queen. And I'd at least like to keep one last monster alive. Okay then, it's settled. I'm gonna keep Queen Toriel alive. I'll protect her from the human. I won't lose. I walk towards Undyne's lab. I hate killing everyone. I just want us all to be happy again. But until that murderous human is gone, we can't be happy. I break down the door to the lab, and trudge in. Nobody is here. Where did everyone go? Maybe they evacuated somewhere here. I look in a bunch of rooms for them. I'm unsuccessful in finding anyone. Suddenly, a figure walks up to me. It's Undyne. Perfect. She looks scared. Heh... it's kind of funny. I CAN'T WAIT TO SEE HER DUST ON THE GROUND! WHY? BECAUSE IT MEAN I'M ONE STEP CLOSER TO KILLING THE HUMAN!!

"Sans... y-you killed A-Alphys... y-you knew I l-loved h-her... h-how... how... HOW COULD YOU?!"

"PFFT- AHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHA! STOP PLAYING DUMB! I KNOW YOU KNOW WHY I'M DOING THIS! YOU THINK I HAVEN'T NOTICED THE CAMERAS EVERYWHERE?! YOUR CAMERAS ARE ABLE TO HEAR WHAT'S GOING ON. YOUR CAMERAS HAVE MICROPHONES IN THEM. SO YOU KNOW ABOUT THE COUNTLESS RESETS, THE GENOCIDE RUNS, THE SUFFERING MY BROTHER HAD TO ENDURE... STOP PRETENDING TO BE CLUELESS!!"

Undyne looks taken aback. Her eyes widen.

"Sans... y-you don't h-have to do this. I-if everyone is evacuated, h-how can t-the human kill anyone?"

"... YOU STILL DON'T GET IT. IF THIS DOESN'T GO THE WAY THE HUMAN WANTS IT, THEY'LL JUST RESET."

She sighs.

"I-I didn't want to do this. But somebody's gotta stop you."

She takes a vial out of her lab-coat pocket. Before she drinks its contents, I impale it with a sharp purple bone. I make her death fast and painless. I know I'm not gonna find the few monsters left who've evacuated. So I leave the lab, and I head over to the judgement hall where the human will meet their permanent demise.