Talk:Papyrus/@comment-104.52.13.240-20151026184726/@comment-27108700-20151026194700

You skip the entire Grillby's segment with Sans, and the run is ended. Sparing anything, even the bosses, automatically boots you back to the neutral run.

Sans will also thank you and tell you that he respects your choice to spare Papyrus. He'll show up as normal for the rest of the game though.