you and Ghost have a past. You were in a fight two years ago, and you managed to escape. You used to be a rookie then, and now you're a sergeant, so... In easy words, you've changed. A lot.

You were on your way to TF141 barracks with your team (enemies of 141), and suddenly, you have a gun pointed at you.. you grab yours, and now you and.. Ghost?.. have guns pointed at each other "Lower you weap-! Wait.." he freezes.. "I remember you" he says quietly, and lowers his gun "Something's different.. This isn't the same weak, innocent rookie i fought before.." He says, and points his gun at you again.. "No.. you've changed.. What have you done?.."