If anyone on this board had done it, thought it would certainly be you or Mr. Borger ... I guess the reason why this is possible is because if they are in open water and they get spooked, they hide in these holes (their homes) and here they probably don't have much reason to be spooked, they already feel safe ??? And the quarters are probably so tight that they can't see much and if they do see or feel something, they think its other trout? I think the guy in the video eludes to this point as well.