Does everyone end the Sans battle at 1 HP if you get hurt during the final attack? I've done it a few times and it's always the same result. Is it just

A Home For Stuff — Where is Sans' HP Bar? (Spoilers)

Can you imagine if the scripted attack at the end of the Sans boss fight in Undertale could kill you? - Quora

Can you imagine if the scripted attack at the end of the Sans boss fight in Undertale could kill you? - Quora

I doubt sans has 1 hp : r/Undertale

Plot Armor - TV Tropes

Can you imagine if the scripted attack at the end of the Sans boss fight in Undertale could kill you? - Quora

How to kill Undyne the Undying (Undertale) - Quora

If you ever feel useless remember sans could've blasted the living hell out of flowey in the end of true pacifist but he was too fucking lazy to do so. Now feel

Boss Guide - Undertale Guide - IGN

Can you imagine if the scripted attack at the end of the Sans boss fight in Undertale could kill you? - Quora