Board Thread:General Discussion/@comment-44634620-20200221163909/@comment-39385741-20200222014300

Sans DOES have one HP. It says so in the files. Saying you can kill other enemies in one hit has nothing to do with that. The amount of damage dealt to him doesn't prove anything either. Damage in the Genocide Route is exaggerated a LOT to show how powerful Frisk becomes. And, it is possible to deal more damage than the enemy's damage counter.

Sans is lazy, but that doesn't mean he can't dodge. Sans is lazy because he doesn't believe that there's a reason to try, since the world will always just be reset again. However, when Frisk does the Genocide Route, Sans wants you to reset, so he attempts to frustrate you enough to do it.