It begins a process of recall and thought.
That might be your problem – you do not write it all, in the first place, because it isn’t all there, in your mind – but you know, or suspect, there is more to do with it than appears. You might not remember it, and that, in itself, could indicate there is trauma attached to it.
Or, it might be that you do not want to give everything away that you do know – you might have some inkling that, if you did, it would harm you in one way or another to say that now.
If it comes down to NaNoWriMo or yourself, save yourself.
This is still a mish-mash, what I have said here, but this is the best I can do for now.