Board Thread:Questions and Answers/@comment-26242189-20160422234238/@comment-26347196-20160515235510

Tbh, I really can't explain this part, either because my brains decided enough theories, or that I wasn't really given enough canonical facts to make out of something.

GetYourFix had an approach, but I don't really want to fully believe on that part, mainly because it's kind of a whole different kind of concept that I'm not sure really ties to the game.

Other than that all six humans confronted Asgore and failed, and their souls persisted after death, I guess I can add another piece of fact that Frisk's heart didn't shatter during the battle against Asriel, but Frisk certainly wasn't dead.