He was walking when he saw his brother's body on the ground.
He saw blood falling from his ribs, and his head was missing.
He only stood there, shocked, staring at that gruesome sight.
"I am going to kill who did this to you, bro." Sans thought.
He saw a little girl wearing a blue and pink shirt holding a knife. She was full of blood on her hands and face.
"Now I know who did all this catastrophe on the Underground now." Sans thought.
She was walking until she find a skeleton. He looked enraged.
"Hey girl." Sans said.
"Yeah?" Frisk said.
"You've been busy." Sans said.
"Yes..." Frisk replied.
"So, I've got a question for ya." Sans said.
"What is it?" Frisk said.
"Do you think even the bad creatures can change if they try?" Sans said.
"I don't know." Frisk said.
"Do you want to have a BAD time? Because, if you took one step foward, you are not going to like what is going to happen here. Trust me." Sans said.
"Shut up!" Frisk shouted, trying to push away Sans from her way.
"Sorry old lady, I'm not letting you pass here." Sans said.
Frisk growled.
"Geez, calm down. You look frustrated with something... you look unsatisfied." Sans said.
Sans sighed.
"It's a beautiful day outside. Birds are singing, flowers are blooming. People like you should be BURNING IN HELL!!!" Sans yelled, making his blaster trying to shoot at Frisk, but she dodged it.
The fight started. It was a very hard fight for Frisk. She tried to kill Sans, but he quickly dodged it.
"What?! You thought I was going to stay here?! You have too much to learn..." Sans said.
"I always wanted to see the surface, but I know this is not going to came true." Sans said.
"I don't care. I just wish you were dead. The surface is like this Underground crap here that you stinky bastards live! All monsters are evil and mean! When this place get destroyed, EVERYTHING IS GOING TO BE FINE!" Frisk shouted.
"SHUT UP! You don't understand how I am feeling right now! You killed the only member of my family that was alive and now say that everything is going to be fine after destroying OUR WORLD?! What is your problem? Monsters aren't evil! I think humans are monsters, not us." Sans said.
"I didn't wanted that our world ended destroyed." Sans said.
"I know you are a good person. I can see inside of you." Sans said.
After the battle, Sans fell on the floor, and sleep. Frisk, decided to attack him, but he quickly got up and dodged.
"You thought you were going to beat me so-" Sans said, only to felt the knife of Frisk slashing him.
"-easily..." Sans said, falling on the ground.
He kneeled down and tried to cover the wound.
He coughed. Some blood fell on the ground.
Sams was bleeding now. His shirt was ripped, and blood was falling from his mouth and dripping on the floor.
"Ok, just don't say I didn't warn you." Sans said.
"I...guess...that's it." Sans said.
"I'm going to Grillby's bar." Sans said.
"Papyrus, do you want anything?" Sans said.
Sans facepalmed.
"Ugh, I forgot. The human killed him." Sans thought.
Before dying, he saw another girl that looked like Frisk, but with a green and yellow shirt, and red eyes. She was giggling.
"What...?" Sans said.
After that his vision turned blurry and he saw only darkness.