Note: this isn't some alternate Disbelief papyrus. It's still the same papyrus, but he realizes that he has to try his very hardest against you. Kind of like papyrus in glitchtale, because he's okay with killing you if it means he can protect those he loves, despite how much he hates killing.
After sans leaves to do exactly that, papyrus decides that this is the perfect time to teach the human a lesson, now that sans won't try to stop him from doing it his way.
Concept: Sans Remembers previous genocide timeline RESETS SPECIFICALLY, meaning he doesn't know of your ability to save and reset. This leads to him believing you always beat everyone first try and effortlessly, leading to sans being even more hopeless than usual. This leads to sans accidentally letting the whole reset thing slip to papyrus one day when he's getting scolded for being lazy. He ends up explaining everything to him and papyrus tells him to tell undyne and asgore.
Link to this sequence: 2869188
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Undertale: Hopeless Route - The Greatest Battle by remix220