IMO there shouldn't be a bit of shame in the entire ordeal. We all strive for a fast, painless, clean kill; we also know the odds of not getting just that are exceptionally high, using the gear that we do. I'll take a spine shot over a gut-punch any day of the season. Pitiful seeing him drag himself along, no doubt - but there are more prolonged and painful alternitives that are possible, even likely. You risked your own safety to see things through to an honorable end, no one living could expect or ask more of you. Congrats on an early season buck and a winter of a full stomach!