There is an issue in Complex where there is a way to get inside one building where the survivors spawn (if playing Flood). A player can walk in the lower level and jump over the door that faces away from the map and can be between the top floor and that door. From there they can out live the flood and rack up kills or “kill farm” and which makes the game less enjoyable to others and my friends. I hope that 343 can solve this in a new Halo 4 update.