(If "skip monologue" is not selected, make Turbowarp do the following:

[Fades into an anxious looking sans smoking, and some faint monster death sounds after a few seconds]

*Kids getting close... I can hear them.

[Scene transitions to a sad sans with his eyes closed and a black background with broken monster souls]

*They actually made it all the ways here... and slaughtered every innocent soul standing in their way

[Sans face changes to his neutral looking left, and the monster souls in the background are replaced by a picture of the Undyne puddle]

*Guess you won our bet after all... But I don't gotta pay 'ya, so that's one good thing to come out of this guess...

[Sans full face is shown looking at the screen for a few seconds with a fully black background, and then his pupils disappear and his face gets more shading]

*That was a joke, of course... This whole situation is bullcrap.

[Scene changes from black back into the Final Hallway, and sans is shown from the side looking at his cigarette]

*I know I can't kill them on my own, and I won't be able to block forever either...

[Sans looks startled for a second, and a sfx of footsteps can be heard. Then he looks towards the source of the sound with his anxious expression]

*Shit they're here, didn't expect them to kill the rest of the monsters so fast...

[Sans pupils fade again and his face becomes serious]

*Welp, it's worth a shot anyways... Here literally goes my whole life.

[The monologue fades out])