Fanatics must be released when a concealing unit comes to within 8" of the enemy or vice versa. The moving unit stops immediately (fliers land). Once the Fanatic's movement has been resolved, the unit can continue moving if the controlling player wishes, although chargers must complete their charge unless panicked. When a Fanatic is released, you may choose the direction in which it travels, and the point on the concealing unit from which it starts. Fanatics move 2D6" using the rules for Random Movement. After release, Fanatics are treated as individual units. In your subsequent turns they move in the Compulsory Moves sub-phase using the Random Movement special rule, but they always move in a random direction.