My current WIP is an YA action/adventure sequel. At around the 1/3 mark in the novel, the MC passes out and wakes up as a captive. Some stuff happens, including almost escaping (he fails) and he passes out again. Then he wakes up and finds out he's been missing for a day, but has no memory of what happened to him beyond a few odd dreams. So, the reader knows what happened to him, but he doesn't. Later in the last quarter of the book, an event triggers his memory of this time.
I'm questioning the placement. Should I move these scenes to the triggering event so the reader finds out when he remembers? I had made up my mind that when I got to this place in the novel, I'd move the scenes, but now I'm questioning it because those scenes are 3 chapters between 2100-2500 words each. That seems like a lot for a "flashback" that late in the book. The key sequence during this time is images of his friends dying in front of him are planted in his mind, which affects his behavior through the rest of the story. If I move that, the reader will get the same flashes of images and dreams of his friends dying but they won't know why he's having them.
Thoughts? Feeling? Need more info?
Oh, and the book is past tense, 1st person in his POV. As it is, it's like he's telling the story as it happens but forgets what had happened to him as soon as he passes out again and wakes up with his friends but the reader already knows.