Board Thread:General Discussion/@comment-27907368-20160506131212/@comment-27907368-20160513192232

Neutral runs certainly involve the protagonist not leaving the Underground. No boss monster SOUL was absorbed, and the message from Sans connects; Undernet does not work outside of the Underground. In the best case scenario, the protagonist is trapped in a void on the inside of the Underground.

The six other humans could load, save and reset. Toriel recalls that all humans hitherto Frisk seemed familiar. The difference between the protagonist and the other humans is that their SOUL shatters before ASGORE, while the other humans' SOULs stayed together after death. In lieu of this, it makes sense why ASGORE kills the protagonist when he is attempting to bottle their SOUL.

Once the SOUL is in a glass jar (completely detached from its physical counterpart), the ability to save/load/reset is gone. As the amalgamates cannot reset, neither can a disembodied human SOUL. Flowey manipulates time without a SOUL. Therefore, time manipulation is related to a physical body and not to a SOUL.