Always be second or third in line and leave a bit of space from the team mate(s) in front of you = best FDF avoidance practice.
… and keep a handful of rocks in your pocket for if that person in front decides to come back towards you to look at the map together or something crazy like that. Nothing keeps away a teammate swarmed by FDF's like a nice 3 oz rock off the forehead ;-)
… I know this to be true because I'm always the person in front....
Sound advice! :) Are you racing?
:( Darn, then I bought too much beer.