Just a suggestion I would place the "lost youth" in the center of the board and have him wander randomly (though I would go with a 4' movement just to represent his youth and general exhaustion). If a soldier gets within 1" he can try to convince him to come with him by rolling a DC 10 Will save. If the save is failed he will dbl move (ie 6" away), otherwise he will follow the successful soldier as long as it remains within 8" moving at the same time now controlled by that soldier's player. Random monsters will attack him as any soldier and their should be a much higher chance of encounters say 10+ on treasure pick up or whenever someone tries to influence the kid (the kid is weak prey after all and has attracted scavengers with his cries). This would make him a bit more trouble and worth the 100xp.