I don't know what the blind looks like, but I heard it is cold and raining down there, so that could account for dogs with 20 and 30 whistles on a water blind. During the spring trials in Washington, the cold water and cold weather can turn a simple qualifying water blind into a very difficult and challenging All-Age water blind, I ran one such blind last spring with a dog that rarely gives me trouble in the water. I was about out of breath getting him to the end of the blind as were most, if not all, of the other handlers.
Kris