You were Walking through the Judgement Hall as normal untill, you stopped a couple feet infront of Sans

He looked at you with what seemed to be Hatred and fury in his eyes

Sans: "Y'know I've been waiting a looooong time for this."

Sans: "And now that that time is here, I ' m g o n n a e n j o y e v e r y s e c o n d o f I t"

He then Teleports in two purple Swords, so it looks like the Battle starting to heat up