Is there a way to script this - to ensure that the Courier stays within a certain radius of the caravan for an unspecified amount of time as they make the trip? If the Courier strays too far, I want to fire a pop-up message ("You are too far away from the Caravan") and ultimately fail the quest if the player decides not to close the distance.
edit
Nevermind. Found the GetDistance function. Now I just need to find a way to stop the player from pulling a quick fast travel and wait.