Scenario: I'm on the home page. I start entering my question, and elaborating. I click next...

I see the additional "Details" box, and realize I should have put most of my text in the "details" box. I copy paste part of my question from the "ask a question" box to "add some details." I've done this twice now without thinking, and on the third time doing it again, I felt annoyed and then had to copy/paste again. I do this because I understand the concept of the headline and the explanation. But I'm frustrated because I'm writing based on stream of consciousness, but the form elements prevent me from doing this. It interrupts my question.

I'm not sure I have any idea on how to solve this - how will users know that all you want in the top box is the question itself or headline vs. the explanation?

Maybe make the first box one line and have a character limit? instead of showing on a few lines, make it longer?