Dusttale: Murderer's Beginning

Sudden Changes.

Sans stood outside of MTT hotel, thinking about ways to stop the human, an idea came to his mind as he walked inside.
He walked over to burgerpants' shop, buying the empty gun before walking away, taking the door to the core and closing it behind, teleporting away.

Some Time Later...

The skeleton would wait for the human to come, his eyes closed as when he heard the familiar steps he would open them, his left eye now glew red as he aimed the gun at them, firing.
The human would sidestep, dodging the bullet as they spoke up:

[ * Aw, no dialogue this time? ] - The human said mockingly as they threw the real knife at Sans' skull, he catched it.
[ * Here, you have a chance of winning increased by 0,1% ] - They said, summoning a gray knife.

[ * i don't need this. ] - Sans said, tossing the knife out of the window.
[ * we're doing this american style. ] - Sans proceeds to aim the gun at Frisk, firing as they jump out of the way and then being met with bones horizontally rising before it was sliced in half by Frisk's knife, meanwhile Sans appeared behind them and summoned a bone glove with sharp claws, stabbing them through the back and aiming the gun at their head, firing.

[LOADED]

The human now sent gray knives flying at Sans, getting blocked by a thick bone wall as it goes towards them at high velocity, they decide to kick the wall, breaking it on two before charging at Sans.
The skeleton summons 3 blasters, each one firing at the time as the human avoided the blasts, using the last one to boost themselves at Sans and jabbing his mandible, sending him back as they rolled back on their feet, summoning a gray knife as they aim at Sans.
Sans would proceed to summon a bone shield, the knife shooting a gray beam as Sans was sent back, now seeing Frisk jumping on him and stab one of his ribs, letting the knife stay in as they barrage him with punches, he would've now charged the revolver as he fired it at Frisk as they were sent flying to a pillar.
Sans now got up as he teleported away.

[ * That comedian got away. ] - The human said, unsatisfied.

They walked out of the hall, going towards the throne room as Asgore turns.

[ * H- ] - Before Assgore could say anything, a gray knife was thrown towards his skull, resulting in his body dusting as Flowey broke his soul.

[ * S-See? I am still your friend! ] - Flowey said, winking at them.

[ * Yes, I do see that, "Flowey". ] - The human said, kneeling as they grabbed Flowey's torso, he trembled in fear.
[ * However... there's one problem. ] - The human said, now ripping Flowey out of the ground.
[ * You're in my way. ] - They said, now slashing Flowey in the face, splitting his head in half.
They dropped the flower and walked away.

Some Time Later...

The human had found every missing monster and killed them except Sans, they stood inside of hotlands as they had just saved.
Suddenly, they were hit by a bullet as they turned around, seeing Sans and smiling.
[ * Nice timing. ] - They said, collapsing to the ground before...

[LOADED]

The human, predicting the bullet dodged to the side, turning around as they point a gray knife at Sans.

[ * You already know you're going to lose, give up already. ] - The human said, grinning at him.

[ * why not test your theory then? ] - Sans said, a machine landing behind him as he backflips, landing on it as it takes flight, now firing at them.

The human avoids the bullets, sending a gray knife towards the machine and destroying one of the machine's guns as another one came out, it was a rocket launcher.
Sans would make the rocket launcher fire at the human, causing an explosion and sending them to the lab as he starts firing towards the lab, making it collapse into the lava.

[ * there ain't no way they survived tha- ] - Right as Sans was about to finish his sentence, several gray knives impaled the machine as he saw a floating large gray knife, the human standing on it.
The knives overloaded in magic, exploding as Sans was flinged, landing near the edges of the ground, the large gray knife now went towards him at incredible speeds, impaling him in the ribcage as he screams in agony, the human backflipping as they grabbed the knife, pushing it forwards and cleaving him in half, killing him.

[ * Easy peasy. ] - The human said, the TRUE RESET button appearing in front of them as they press it, resetting the timeline and erasing everyone's memories about this one, including Sans'