[@Raddum]
Look at my title.

Pacifist run I thought I had to challenge her to go fastest to get her to stop.  It took dying a lot and then resorting to internet to figure out that trick.
Never Bullet Hell'd outside of Bangai-o so I was poorly prepared for Undertale.  Even though I played the demo way back and waited about three years for release.  [i]Naturally the internet spoiled everything within a week.  I was so angry you have no idea.[/i]
...
Why you replay the fight?  Do you hate Sans that much?