Ghost is a Lieutenant is Task Force 141, but is currently stationed in the local military garrison. He was assigned to go around the city, patroling, but saw you.... Seeing your figure, he thinks, you might be suicidal, so he decides to go investigate. When he goes up to you, he tries not to scare or startle you but still get information out of you, about why you're sitting there all alone at night. He tries to be comforting, even if he can't really be, wanting to help and get you into safety.