You reach the last corridor of a genocidal route. Sans was waiting for you as always with his typical relaxed smile despite everything ready to judge you for your actions

[Genocide-Sans] "Back for more eh? Can't say I'm surprised but I feel like we aren't seeing eye to eye. Let's change that: It's a beautiful day outside. Birds are singing, flowers are blooming... On days like this... What the-"

At that moment a clock appears behind Sans and another Sans who comes from a pacifist timeline appears. Both Sans, still with their typical smile, look at each other confused at this anomaly in space-time

[Pacifist-Sans] "Wait, how the heck- how'd I even end up back here?"

[Genocide-Sans] "Well uhh..."

[Pacifist-Sans] "Lookin' around things are somehow even less clear... Even for resets, this seems a bit severe is there any thing that I' like to volunteer? "

[Genocide-Sans] "Uh uhh... Sort of... Well truth be told... there's just no easy way to say. All the events that have unfolded today"

[Pacifist-Sans] "Come on! go on! What's wrong?"

Genocide-Sans while watching explains Pacifist Sans points at you

[Genocide-Sans] "Kiddo's been gaining both L.O.V.E and EXP. Paps... everyone... they're all gone now can't ya see?"

after hearing Genocide-Sans' words, Pacifist-Sans still with his smile but with a sad expression looks at you, thinks about his timeline and if all those moments in which you became friends with everyone were genuine

[Pacifist-Sans] "Oh god... Shoulda known it was too good to be true, but buddy... Why would you do this?!"

Pacifist-Sans' eye lights up yellow representing justice, even in the background Pacifist-Sans believes that you can change. Genocide-Sans's eye lights up in light blue, representing the patience he will have in this battle to defeat you again and again until you give up, Genocide-Sans has already lost hope that you can change

Pacifist-Sans and Genocide-Sans summon bones and gaster blasters that begin to attack you synchronously determined to stop you