Sans hesitated to kill them. he didn't know why? is it they were injured and can't move an inch, maybe because that they spend much happily in the underground, or because it the timeline.

Sans approach them, looking down while they were in pain.

Sans sighed.

"You guys were pretty pathetic, it's 2 vs 1 but still I still beat you. Heh, Now you understand the sins crawling on your back" said Sans while his eyes were black.

Chara was angry and tries to slash sans but the pain was too much.

Sans pulled something into his pocket. It's two monster candy. "Here, make sure that you guys eat this when the pain's gone".

Frisk and Chara were confused.

"Why are you giving us that?" Chara asked.

"Why? I'm just bone-tired of doing the same thing over and over again every timeline and building trust in each other, you know, I'll just let you go this time, and change your choice doing genocide in the next timeline But I won't let you kill me though hehe," said Sans.

Frisk and Chara were looking at each other. "I know you were going to betray us later on, so kill us already," Frisk asked. "Kid, I'm serious. So, eat them" Sans said to Frisk.

"Alright / Ok," said Frisk and Chara.