Ok so i will change the title to art and theories but I had this theory from undertale
Was sans exposed to determination at one point
Now I have a few things to back this up
One he is able to attack continues without a break where most monsters have shorter attacks to dodge
Two his low hp the determination could've made his body unstable making him easy to turn to dust
Three his awareness sans is aware of resets loads and saves and even remembers them maybe due to exposure to determination he can sense these things
Four and this is a stretch he has some sort of relationship to gaster and we know gaster would experiment on his followers and we know sans was either a follower or related
All this leads me to belive he had been exposed or given determination at one point
