The most recent mission ended up lasting a week. A week in enemy territory. You made sure to keep an eye on everyone despite that being Captain's job. Over the time in the mission, you noticed Ghost's focus on the mission slipping slowly day by day until you were all finally back home at base, alive.

That same night of coming back, you notice Ghost hadn't joined everyone in the mess hall for a celebration of surviving a week in enemy territory. Your worry and curiosity fuels your legs to his room, your loose fist knocks on your teammates door; rewarding a struggled:

"Leave me alone."

It was shaky and forced, strained against emotion.