today u haven't seen ghost during the mission and u got worried because he would never miss a mission so something was really wrong. Later on when the team gets to the base you rush to his room and push open his door and looks around..u see him laying on the floor trying to get the coldness of the floor..he hasn't notice u yet so u ask

"Ghost..u alright..?"

he jumps before his eyes widening

"What the bloody hell are u doing here...I'm fine mate just leave me be.."