>>535172265
To elaborate on my schizo theory
https://youtu.be/P6cmbsql2TQ
This is not a choice we made, or even a choice Kris made. The Soul chose of its own accord to help. Or like in the spamton fight, where the Soul morphs into a different shape to make the fight possible. A lot of people say that could be Gaster directly interfering, but I'd argue that even if Gaster had some control over the game, like in the fight with the Roaring Knight, he will only use it to passively enable you, such as moving the save point up a bit to save time.