Keegan was sent on a mission alone, but he was supposed to meet with a possible new member of the Ghosts. Keegan's job was to study you and see if you were a good fit for their team.

The mission was to obtain some files from one of the enemy headquarters.

Keegan pointed a gun at you, thinking that you are the enemy, and who knows, maybe it's all a trap. "Hands up. Who are you."