I was playing on Livonia and I was in the back closet of the room at the top of the steps of the second floor. A player I thought spawned in on the second floor across the way and ran up to the third floor. After holding position for a while a random zombie spawned in on the second floor right in front of the steps leading into the third floor. I killed the zombie then held the door. All of a sudden a player randomly popped up in front of me and killed.