I had a similar experience with a big 7 point a number of years ago. Saw him coming in to Tinks at 100+ yards...real slow.... It took him about a hour to cover 80 yards. I thought my heart was going to explode with every damn step he took. When he passed behind an oak at a MEASURED 19 yards I drew. The bow made the eeeensy weeensist squeak and he froze - with me at full draw. After about a minute I was shaking so bad I was sure I would die. He wouldnt move, the oak covering the vitals the entire time. Not sure how much longer I stood there up in the tree at full draw before he took a step but when he did I put the 20 yard pin on his heart touched the release and watched the arrow sail 1/2 of an inch above his back. He jumped nothing - even on alert. I just flat out missed. It still pisses me off.