IMO if there was even the least bit of doubt about it being a good shot opportunity, It SHOULD NOT have been taken.... we owe it to ourselves to our prey(the deer) and to every hunter out there to insure a clean shot/kill.
I know if i were the prey and some fast fingered buck took a pot shot at me as i was running just injuring me, possibly leading to a long painful infected miserable death, I' d be pissed
but if the same buck knew he could make that shot no question,and he thumped me cold and killed me clean I' d be a happy camper albeit a dead one but happy!
You did the right thing its up to us to educate the hunters who make the rest of us and the sport look bad and inhumane!