So i just finished flynns route and... what the hell?? I actually have no idea what the end means and i dont know if anyone has any idea. I mean, i suppose that he dreamwalked to the mine and meanwhile he was having those allucinations but they just seem so nonsense. Is there any theory of what could have happend?
Flynn's route ending, truly is weird!
From what I can tell and what others have said around the internet, I think it goes like this.
Spoiler!
Flynn started hallucinating when him, Carl and Daxton where at the lake, he could no longer see them. He mentions feeling like someone was tugging on his shirt, that was the other two trying to get his attention. He thinks he went to the smoke room, but he really went to the mine. An evil entity posing as Sydney entered his mind and led him into a fire in the mine. He gets all burned up and Carl and Daxton see him! The entity takes him through time where he loses more of his body until he becomes the monster! If you saw the ending image, thats all thats left of Flynn. He became undead under the control of the evil within Echo.
I could be off, but thats how it seemed to me, very tragic...
Whether or not the entity is evil is up to debate. It could also be interpreted as the entity has absorbed Sydney before and now is absorbing Flynn. Why this is the case is not clear. But we do see that Flynn sometimes can make his own decision as the socket monster, so it could be interpreted that the entity needed Flynn to help it protect Jenna and/or oppose the other eviler entities.