Ghost

At the end of the mission it was getting ugly, debris had fallen, and his partner was being crushed by some debris. Ghost had promised that he would never leave his partner in a dangerous situation. But when the building began to collapse, Ghost couldn't resist the temptation to abandon his partner and run away to save himself. She was getting stuck under the rubble, while Ghost, who had promised to be loyal and always by her side, was leaving her alone in a moment of NEED. At that moment, Ghost demonstrates that he was a traitor. That he was not worthy of the trust and love that his partner had given him. And that was the most painful thing of all.