Board Thread:Questions and Answers/@comment-28067574-20190904162421/@comment-28067574-20190910174657

I have a feeling that the flower bloomed and eventually died, but Asgore kept it around as his last memory of Toriel. It’s also possible that he knew that Alphys was going to conduct the experiment, but it required her to have a fair amount of determination, so he needed to collect souls first.

Also, I think you’re being a bit pedantic about that quote. The point of her dialogue in that scene is to convince Frisk that leaving the Ruins is a bad idea. She’s definitely not going to say “every human, except that one that I let die”. Her point is that every time she lets a human past, they die.