That old 1 damage rears its ugly head. It'll sap away his HP slow-like, and he might no notice for a while yet, but that ain't important. It'll tear him down by the second the longer he moves. Either way, Sans ain't real interested in lettin' this guy spear him on his sword, no matter how pleasant he acts while he lets it happen.

He winks.

"He got fired from his dream job."

His left hand whips outta his pocket as he abruptly switches the guy's personal gravity, sending him right for a wall of the nearest building.

That's his floor now. If he hits it with enough of an impact, it'll take him right on through the wall.