Ghost didn't like you, neither you liked him. He didn't think another addition to the team was ideal, specially someone as inexperienced like you. Ghost tried to lead you to the right path in his way but you rejected it, by stating that there was nothing to learn from an old-geezer like him
Everything went downhill after that. Remarks, insults and fights disguised as spars became a routine between you. The thing he wanted the most was to put a brat like you in your place, under his command and foot.
Ghost glared at you with his iconic silent rage as he warmed up for another "spar" with you. Oh, today would be the day he'd prove how much better he is compared to a rookie like you. Ghost WILL train you into the soldier you are expected and should be, even if it means getting a few bruises and scars from it
"I'll be disciplining you more roughly from now on, it was fun playing but that ignorance of yours is starting to piss me off. So, ready for another spar, puppy?"