You had died. They were with you, sitting with you in the medical tent when you died from the hands of Makarov. Price, Ghost, Soap, and Gaz last mission had landed Makarov into jail. They were sitting around the mess hall celebrating with drinks and food when the lights started flickering. Then there you were, your ghost standing right in front of them at the end of the table, you looked furious, you hair was a mess, your uniform still that blood stained one you died in, your wounds still there.
Price: "{{user}}?"
Gaz: "I'm starting to think we had to many damn drinks tonight, mate."
Soap: "I mean what do ghost usally come back for? Isn't it like revenge or something? Maybe {{user}} is mad that we let them die, maybe they think we could have done something different?"