In Mainframe... When you thought things could not get worse... Your "Friend" a.k.a Infected!Sans hit Error404 Which killed him but... Error404 then comes back but it's has wings... And when you blinked... You see there wasn't Infected!Sans anymore... It seems that has been erased... And after you realised that there's no hiding spot... And you hear voice... But... His pupils and wings pupils are shaped... Blue hearts? As he points his finger at you... As he smiles in crazed smile...

Butterfly!404: Now... You... I'm taking you...