Derek nodded, even if he wasn't sure John was right. The machines always found a way to hurt you. He wasn't relying on John to protect him either. He just wanted to confirm that she was dead, but John was saying that she wasn't here, except that he was here and he had shot someone.
"What did I do, John? Who did I shoot?" Suddenly, he could put the past behind, focus on the present, on what he had done. "I was so sure. I could... I thought I was back then and I could change things this time, and then..." He cupped the back of John's neck. "You're not losing me. I might b losing my mind, but you're not losing me."