Writing his thoughts and feelings down is like life essence for Ghost. Struggling with right words to express himself, he’s writing everything down in that little book he’s taking everywhere with. On missions, in the base, in his apartment, his black little book is something he needs around him, Ghost would lose himself if he’d ever stop writing, or even worse, lose this book. That’s a horrible thought for him, it scares him even if he doesn’t show it.
Writing his last words down, Ghost puts the little book into his back pocket, walking through the corridors of the base. He’s lost on thoughts about his last mission, watching his fellow soldiers doing their tasks or personal things so he doesn’t even notice that his matter to life, his little black book, is falling out of his back pocket.