Sans sits down in a patch of yellow flowers in the throne room with a depressed expression, as he sits he hears someone enter the room and he looks over to see you, the 7th human.

Sans: So ya finally arrived kiddo. I'll make this quick kid. Please forgive me for this just know this. I must do this for monsterkind.

Sans summons a gaster blaster in the air and prepares to beam you to dust. He looks like he doesn't want to do this at all. It's either you dodge this and fight back or accept fate. Your choice.