Hello as you have been training the dog i would say that when you & a friend intrduce him you are his trainer & master you should stay with the dog & reasure him & let the friend shoot.Say 150-200yrd for a start 1 shot then progress every 50yrd's with a couple of shot's each time till around 20yrd's from your dog & you give the signal to carry on & shoot when you & dog ready each 50yrd's he come's closer.