"What!? That's you're plan!?"

It sounded ridiculous. Your brother using Sans to sabotage the peace treaty humans and monsters have recently established. This event is supposed to be a day to go down in history, even if you were aware that XGaster might overwrite the timeline any moment now.

But using Sans to attack them on stage? That's just a little... Too much?

No, you get where Frisk is coming from. You have been by his side, and Chara's as well, since the start. You would probably do the same if you were in his shoes.

"We're running out of options."