I noticed the same thing the first time i shot my bow out of my Penthouse blind. It was so loud inside there. I have only got the chance to take 1 shot a deer out of my bow at a deer and it jumped the string. I dont think it was because of the noise, the doe was nervous when she came in. I think she was just weary of the new object in the area. Dont really know if they can hear the bow inside the blind, im sure it muffles the sound hear outside alot. I have seen so many people use ground blinds successfully on t.v. that it makes me believe that the sound inside the blind doesnt make much diffrence.

Dave