I have a significant event in my worldbuilding that happens in the past -- think Dumbledore taking down Grindelwald years before the main HP books, except in my case the event directly influences the climax of the book, so it needs to be known to the reader. I don't want to infodump this event through exposition or dialogue. I'm leaning towards a full narrative flashback scene showing it all as it happened. Is this looked down upon as bad writing, or lazy writing? There used to be a bit of discourse about flashback scenes back in the day. Not sure what the vibe is now. I'm 71k in and the scene is next in my outline, so around the 75k mark. Not shoehorned at the beginning, and there have been references to it leading up to this point in the book.