"Determination." Gaster repeats. "That is the name of the human's power. Extracted from the souls of the children who fell. I remember."
"i know g."
"I extracted Determination from the soul of the first fallen, Chara, then injected it into you."
Sans gasps at his sudden realization. " you... gave me these powers?"
"Yes. And now you are trying to kill me with them. I believe you can see the irony in that, can't you?"
"yep, but back to the matter at hand. you hurt pap, so now i'm gonna hurt you. go ahead g. show me what you've got."
"Of course." Gaster sends forth the red hand, which fires a beam. Sans easily dodges, then retaliates with one of his own. The green hand creates a shield to protect Gaster, then forms a shield around Sans. Sans sends a bone sraight through the green hand, shattering it. The shield around him dissipates.
"What?! How did you do that?!" Gaster is shocked. Sans just shrugs.
"i hit it with a bone. it was easy."
Gaster retaliates with a combination of the remaining six hands. Sans dodges the beam from the red hand, and has the saw blades cut the light blue strings wrapped around his wrists. He redirects the saw blades toward the small orange spheres and sends sends everything towards Gaster. The purple hand duplicates the assault to hold it off, but is too slow and is destroyed. The crack in Gaster's head gets deeper. The light blue hand wraps strings around Sans, but Sans grabs a hold of the strings and swings the hand down, smashing it into pieces on the floor. The crack grows deeper. Gaster clenches his fists and muffles a yell.
"what's the matter g? you getting 'bone' tired yet?" Gaster only yells in response.
The yellow hand attacks with a series of shots that Sans effortlessly dodges. He sends a round of bones toward the second volley and destroys them all. One lone extra bone flies past and straight into the yellow hand. The dark blue hand sends two more saw blades towards Sans. One aims directly toward Sans, while the other loops around behind him. Sans catches the first and takes control of it, but narrowly avoids being sliced in half by the second one.Gaster attempts the same trick again, but Sans steps aside, allowing the two blades to meet and destroy each other. He sends the blade he took towards the dark blue hand, shattering it. The crack becomes deeper, and forms several smaller cracks from it.
"havin' a little trouble? i'd give you a 'hand' but i'm fresh out. could you spare me one?"
"ENOUGH!!" Gaster turns the red hand orange and fills half of the room with small white orbs. Sans grabs one. When they turn orange, Sans teleports to one of the orange hands and throws the orb on it. The orbs explode, including the one on the hand. The crack becomes very deep, and Gaster drops to his knee. The red hand fires a beam at Sans, but he blocks it with a bone. The hand fires again, but it's blocked by a gaster blaster. Sans fires the blaster at the hand, destroying it. Gaster sweats and pants heavily in defeat.
"sorry g. this is what has to happen."