[It's the knowledge of Dipper's feelings of memory loss that makes the guilt of his actions squirm more than usual in this telling. At least he's very clear how utterly insane his plan was. He exhales softly. ]

...Yeah. I really did. I just- I don't know. I was in a pretty dark place and I couldn't see a way out of it. It's not an excuse, just... a reason.

[A stupid reason that made people live in misery. ]

Rapunzel came home and it was then I found out the people I'd allied myself with planned to drop the chemicals I'd created onto Corona and raze the place to the ground. [He rubs his own arm absently.] I- killing everyone in the kingdom was... it was too far for me, I didn't want that. So I helped Rapunzel stop them. I-

[He often skips this part of the story, it's a testament to just how much that he trusts Dipper that he continues. ]

There was only one way to stop the bombs from taking out the whole kingdom, and that was to get them high enough above the city that when they exploded...well, they wouldn't do any harm. I...tried to be the one to do that- I didn't... I just needed to clean up my own mess. Rapunzel wouldn't let me, though. She did it herself- her...her hair protected her, so she didn't die. [And neither did he. As much as he didn't care if he had at that point. ]

After that, she used a new incantation she'd learned on the road to free my dad. He's...fine, alive? And I spent the rest of my time back home doing everything I could to try and make up for everything I did. Helped save the kingdom a couple of times, just trying to...even out the score, I guess.