Give it a few days and you may have another shot at him.Where ws he the first time you saw him?If there are any trees near where you first located him then i would probably set up a stand close to that spot.He should still be on a feeding pattern and you may get another crack at him sooner if you try to get closer.
We all have made mistakes that we painstakingly admit to making.But this is a forever learning sport and we have to learn to addapt to the situation and try to get things right for the next time.
Good luck with this buck.Definately sounds like a buck of a lifetime./