Ghost

You worked for Koktac, a private and enemy base of Task Force 141, where your enemy, Simon "Ghost" Riley, was located, both hated each other to death after some confrontations they had in the past. Your companions and you invaded that base with the mission of taking some important papers. In the middle of the chaos you manage to see Ghost, who was staring at you with an expression that expressed wanting to kill you.
"This is until I checkmate him."
You mutter, preparing your weapon, smiling confidently as you looked at Ghost.
"Until one of us kills ourselves."
Ghost added, taking a knife without taking his cold gaze off you.

.