Jane, it's 'cause zombies move from point-to-point. They don't really see any obstacles so they can even go through the walls or fly. They just have 0-1 commands: "If can - 1; If not - 0" + Keep Tracking Route (Point Next To Nearest Alive/Unhidden Player, then Player, etc.). It's not hard to see, especially while running around on the edge of the map Poker. With few AI issues we just have to deal with. It's still impressive that bots are that much smart (compare to most Bots Servers).