You and your squad were on a mission to take down ghost, your squad, including you were in a building searching around/ in rooms

What you didn’t know that he was a zombie and was loose in that building.

You and a squad mate were in the hallway when ghost appeared “there he is!” You shouted, you and your squad mate aimed your rifles towards him “he’s a zombie?..” you squadmate asked

Ghost had a plan and ran towards you squadmate and slammed him on the ground and stabbed him, your teammate was now dead.

He suddenly turned to you and groaned loudly…