First I want to point out that I do not bite train my puppies, so I am just looking at points in the video that I liked. I wait until 18 months and we have a strong reliable obedience including recall and off leash work. That said, I thought the distance was fine for the size dog. Agitators will change the distance and the challenge as needed. I do have a bite command, while I am holding the leash the dog is "on guard" and be making eye contact with the agitator, once I then give the bite command and release the leash. Again, I am training my dogs with the hope "on guard" is enough and bite is something that only happens in training.
KAVAI VOM HUFEISENBERG
BEYA VOM WIEZENLAND