Quick message flashes on screen? (end game spoilers)

[RedSage]

So, I haven't played the game in a while, but there was something that stuck out to me the last time I did play. When I was fighting Sans, I ragequit hard during one fight. Key part here being DURING the fight, not after in the hall. When I quit, I saw a quick, seemingly 1 frame message flash on the screen just before the game closed, kind of like the messages Flowey leaves you when he beats you. The message was something along the lines of "And don't come back." with Sans's sprite still in the center of the screen. I've however looked at the wikia, and can't find any info on this.

Anyone know what he says/if this occurence has been documented?

[Bubblextra]

it’s been 8 years and not a single person has replied

[The baa!]

Likley gltiched out somehow but sans, when he pranks you, says "if were friends, dont come back", after you spare him

[BuryPunny]

I just beat my first run, was told my Flowey I could change the outcome if I went to see Alphys and things would be different. So I load, go down to the hotel. Save, then quit. (It's late and time for bed)
When I quit there was this single frame message that I couldn't read entirely but it said something like "... You're only going to do this with one life?"

There is no info anywhere on the internet about it 💀

[ScreamingFeline]

Originally posted by BuryPunny:

I just beat my first run, was told my Flowey I could change the outcome if I went to see Alphys and things would be different. So I load, go down to the hotel. Save, then quit. (It's late and time for bed)
When I quit there was this single frame message that I couldn't read entirely but it said something like "... You're only going to do this with one life?"

There is no info anywhere on the internet about it 💀

I'm also replaying true pacifist route and closed the game in the true lab, and some text appeared for one frame. I wasn't paying attention because I wasn't expecting it but the sentence ended in "get it?" I've played this route multiple times before and never noticed anything like that and this post is the only thing I can find online about it lmao

[The Official Dwayne "The Rock" J]

pretty sure its a bug