I've passed a lot more than I've shot. One was the biggest buck I've seen from the stand, but it was near the end of legal shooting time and something just felt wrong. I felt kind of sick at first to see such a monster walk out of my life, but the next morning I was back in the same stand. As the sun lit up the area where the buck was standing, I could see some twiggy little branches which would have been between me and his vitals. They were small enough that I couldn't see them the night before, but certainly large enough to have deflected an arrow and perhaps wounding, or worse yet, gut shooting, a fine animal.
You did the right thing at the moment. Kirk is just kidding...I hope!
What part of Iowa are you from? I live in North Central Iowa, but hunt most of the time in Northeast Iowa.