so, the human after many resets, things got corrupted and glitchy. so dt!sans got teleported into last breath au. lb!sans is confused by what happened and why there is another sans. but he feels that the other sans has done terrible things.

dt!sans is confused as well, he was waiting for the human, and now he is still in the last corridor, but different??? and so lb!sans says "uh- what? who are you?"

and dt!sans is like "mind: huh? he kinda act like papyrus.. heh" so he doesnt waste any more time. he needs to get stronger to defeat the human, and since there is more exp starts to fight lb!sans

and so the fight begin, i think that dt!sans phase 1 would be MUCH stronger than last breath phase 1/2, they fight, and then lb!sans goes into phase 3 and almost "kill" dt!sans witch now he also goes into phase 3, but still, he still lose. then he got an idea, the souls. but lb!sans wont let him and so he dusts him with a gaster blaster before he could run away.

(so what did you think about this?)

(also dont take it personal its still my take)