"No, it's not that," he said, steadying himself against one of the chairs. "Ever since the crash...it used to happen in my dreams, so I thought I was imagining it or it was a flashback to the crash I'd somehow kept when I suffered the memory loss. Then, three weeks ago, it started happening while I was awake. It happens so quickly all I get is a sharp pain in my head and an image of...it's someone with their back to me, that's all I can ever tell."