I can't remember the people that made the film but a few years ago a group of archers presented within their film slow motion shots of the deer and the path of the arrow together. It was amazing how fast an animal could react to the sound of the bow. If the deer reacted to a lung shot, the hunkering down of the animal either made a high hit or a miss over the back. Heart shots resulted in a high hit. Someone actually did caculations between the speed of sound and the arrow speed. The deers' reaction time won everytime.
A blind with a small shooting opening "may" act as a supressor to the sound of the bow but I would wonder how much. Maybe you could record both sounds and then play them back with a decible meter.
You might find that the animals reaction is actually not to sound, but a sudden unexplainable movement in the peripheral vision of the animal. Hey, your either quick out there or your dead! Have you ever watched other hunters in the woods dressed in camoflauge or military in gilli suits? Some are extremely hard to see, but any movement and there spotted.
I think that the big picture here is the reason they call it hunting instead of calling it going to the market. :grin: