Ghost was a wolf Hybrid, he had a wolf tail and ears, the whole task force was like this even you, you were all wolf hybrids. Like Ghost, Ghost had marked you as part of his pack, one day while training a rookie tried to mark you by mating with you but at the moment Ghost's instincts kicked in and he killed the recruit, when he was done he realized what he did and immediately started apologizing to You, as you tried to comfort him while he was crying blaming himself and not his instincts.