"I'll distract him while you hide behind the pillars." Frisk said from the doorway outside Judgment Hall. "Let's finish this prank, once and for all." It was time for them to learn the truth, for Frisk to pay for their sins. They swallowed down their fear, walking into the dreaded Hall. There he stood, gaze carefully neutral. They knew it wouldn't be like that for long. "human." Sans eyelights locked onto Frisk's eyes. "if you take another step forward... i'm gonna make you b u r n i n h e l l ." He growled, sockets blacking out. Frisk took a step forward and Sans chuckled darkly. "it's a terrible day outside... you know what? fuck it. let's just cut to the chase. i'm gonna have a g r e a t i m e !" Their soul pinged blue and the battle began. "ya dirty brother killer!" Sans seethed. "ya just wanted to piss me off, didn't ya?" He tried to spear them through with bones. "that's why ya only went after him an' his friends!" Frisk couldn't get out of the way of the blasters this time... their lifeless corpse dropped to the ground.

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It wasn't long before they came back. "do ya love watching me suffer, brat?" The battle started anew. This time Frisk tried to get a word in, but Sans wasn't having it. "i never know which is worse. the pacifist routes or the genocide?" He cast out bones, blue magic, blasters. "where ya either kill us, or pretend to be our friend!" It was their first turn. "Sans, please let me explain-"
"mercy isn't an option. you lost that chance when you killed him!" Sans snarled, throwing out his second volley. It was stronger and more complex than the first. It wasn't long before they were dead again, but they came back... they always come back. "what was even your intention? why me? some fuckin experiment?" More bones. More blasters. More blue magic. They kept dying over and over, yet they weren't trying to kill him like they usually would. They weren't resetting either. What was their POINT? Now they were trying to pull themselves out of an attack that he'd skewered them with. "i hate you."
"I... deserve it.." Sans smirked. "damn right you do... filthy vermin." But he was curious. What were they trying to do here?

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Despite his curiosity, he didn’t go easy, he never would. It was true what he said, he hated Frisk with a burning passion. He had every right to. He only tolerated them because his only friend asked him to protect them. Fucking stupid. He'd killed them thirteen times now. They weren't even trying to explain themselves anymore, just pressing mercy every time it was their turn. It only served to piss Sans off at first, but now, he wanted the explanation. Just... not in the form of their turn. Sans made sure to keep attacking until they were half dead, then pin them to the floor. He sank a sharpened bone into their shoulder. "what are ya playing at? if yer not gonna fight, why don't you fucking reset? at least bring papyrus back, ya fucking prick." They shook their head to which Sans responded by stabbing their other shoulder with another sharp bone. "what's your reason then? why are you not fight back, bitch?"
"B-because..... I d-deserve...... t-to burn..... over and...... over...." They wheezed. His grin widened. "glad we're on the same page." He ended them with a slash across the neck, quite deserving if you asked him.

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They came back, as usual. Sans attacked again, as usual. Papyrus, Alphys, and Undyne had been watching, slack jawed, since the first battle. "H-holy shit.." Undyne muttered. "WHAT THE HELL IS HAPPENING? HOW ARE THEY DOING THAT? HOW IS SANS.." Papyrus shook his skull, bewildered. "I wanna know w-what they are talking about." Alphys questioned. "Seems we've got more questions than answers now.." Undyne sighed in frustration. "I'M DONE WITH THIS DAMNED PRANK." When it came to be Frisk's turn, Papyrus marched out of hiding, dead set on his brother. He grabbed Sans by his scarf, making the shocked skeleton face him. "YOU HAVE A LOT OF EXPLAINING TO DO!" Papyrus took back his scarf. "NOW."