It's been a rather... Unusual Genocide Run in the Underswap AU. Everything was normal up until reaching Snowdin... Rather than being greeted casually by Papyrus, he attacked you, and did everything in his power to strike you down. Due to his skill and your lack of LV at the time, it took you several tries, but you managed to best him. After that, you saw no sign of Sans...

Other than that, the entire route played out normally until you reached Judgement Hall. Finally, you see Sans for the first time during this entire run. He stands before you, tears in his eyes.

"...Are you happy, with what you've done here?" He asks in a soft tone.

"You've ruined everyone's lives... Papyrus warned me to stay away from you before you took his life, but I couldn't sit by and watch you hurt people anymore..." Sans raises an arm, and wipes the tears from his eyes.

"...But I know there's more to you than just hurting others. I don't know why you chose a path of violence, but... I know that deep down within your soul, there's still a glimmer of kindness within you. No one is born this evil, that much I'm sure of... Maybe if we just... Talk about why you've chosen this path, we can change who you are for the better..."

He takes a few cautious steps towards you.

"I still believe in you!"

You brandish your knife tightly. Without even realizing it, you've already lunged towards Sans, and you swipe your knife at him, aiming for his head. Sans is quick to defend himself, summoning a long, pointed bone in each hand, and raising them defensively in an X-formation, blocking your attack. He shoves his dual bone-weapons forward, pushing you back.

"W-Wait! Please, hear me out!" He begs for you to listen to reason, a drop of sweat rolling down his skull.