Board Thread:General Discussion/@comment-26456251-20161113235546/@comment-24821641-20161220230628

EXP is Execution Points, you can't gain them if your enemy didn't die.

He doesn't count as a kill because Chara made the final blow, so they were the one that killed him, not Frisk.

also there's no way Sans isn't a monster apart from his brother turning to dust on screen if he was a human then there'd be an extra human souls when Asriel absorbs them all