I have pondered this very thing since I killed my first deer in 1991. I think that as soon as the adrenaline wears off I begin to get "that feeling" that you are referring to. Over the years I have begun to debate whether it is truly remorse or just the "crash" associated with the amazing high that I experienced. I don't know that I have an answer to that for myself yet. All I know is that I feel and have felt that way about every big game animal I have ever taken. Every one. The one thing I do know for certain is that every time I am able to take an animal with my bow I am caught up in the totallity of it and find myself truly in awe of our world and how blessed we all are to be a part of it.