Talk:SAVE/@comment-3485846-20151107062507

"However, this ability is superseded by the player character's own determination, stripping him of this power upon your entrance to the Underground."

*Spoiler stuff*

Could it be assumed that it's not Frisk, or Chara's Determination, but the Determination of the player that enables saving? Chara itself states that it didn't return by itself, but rather we brought it back, and guided it to overcome the most insurmountable odds to achieve it's goal. Additionally, Flowey mentions that he had the power to save, until Frisk/the player arrived. Sounds like our Determination, to me.