Took losing a couple for me to learn my lesson. You see blood and keep thinking that he’s laying just out of sight. You keep going. Eventually, you see where the deer laid down, but you start thinking, well he laid down so he must be near the end, he’s probably laying up ahead, just out of sight. Then maybe you find where he bedded a second time, but you’re all in at this point, he’s got to be close to the end so you press on. And then, suddenly, the blood trail ends. Lost deer. IMO you simply can’t bump a wounded deer that’s giving a thin or spotty blood trail. Shoot, don’t move for an hour, check the arrow, dark red blood, check the blood trail, thin or spotty after 50 yds, back out, wait 4 or 5 hrs minimum, same with good, dark red blood and no deer after 100 yds. Stomach content or watery blood, back out, come back in the morning. Consider that you are shooting mechanicals that will do massive damage with solid shot placement. It stands to reason if there’s no dead deer within 50 or 100yds depending on the evidence, then obviously the shot placement did not produce an immediate, lethal wound and you need to give the deer time to die in it’s first bed, which usually isn’t far away and to where the little blood there is will lead you later. Remember when it’s shot, the deer doesn’t know what happened, it just knows it suddenly feels bad and needs to lay down. But when you come stumbling along looking for it, the deer 100% knows you are a threat and that it needs to get as far away from you as possible. Any doubt, back out. Good Luck!