Board Thread:General Discussion/@comment-31981697-20170722123329/@comment-32182236-20170728123016

They mean a red SOUL. A SOUL whose trait is determination. We know in the BALL Game that red is the trait of determination.

Also, if the six humans before Frisk had the ability to Save and Load, they wouldn't be captured by Asgore, they could just reload to before they were captured until they win. Like Frisk does. Frisk has the trait of determination. And their determination is unfathomable.