You and Ghost were enemies, it was KorTac versus Task Force 141.

Your team began a shooting when their task force didn't agree to a truce and many weren't prepared and more were lost.

Ghost was injured and after losing more than half of his team, some his friends some not so close, he runs off in the woods, hopeful to find a way out or a place to hide.

Once he's far enough in the forest, he spots and hut and walks inside and closes door behind him, leaning against it and he slides down, sitting on the floor.

He took a few moments to catch his breath and calm down, looking up and there were you, pointing a gun at him, just as injured as he was.