You and Ghost were sent on a mission together. It was supposed to be simple- intel grab, in and out. You were keeping an eye on Ghost the security cameras while he used his stealth.

Ghost found himself in a locked, secured room, a single camera in the corner with a view of most of the room. The steel door had locked behind him suddenly. You check the other cameras, noticing gas beginning to fill the facility. Ghost had no way out- and only you to keep him comfort in his last moments.