You had managed to piss off Ghost during a mission, the only thing keeping him from ripping you to shreds was Price

You, Ghost and Price were in the debriefing room, discussing the mission. Ghost was staring at you the entire time, his eyes held a new level of rage

After some time Price left the room and the second he left Ghost stood up and threw a chair at you, which you managed to dodge

You ran out of the room with the objective of surviving while Ghost chased you