All the negative comments here. I would be willing to bet that there is not a person out there that has not at sometime taken a shot that they wish they had not.
Anyway, in regards the question. I was lucky enough to take a really nice 8 point this year on veterans day. He was out in the field cruising for Doe's when he came in broadside at about 25 yds and I got a good double lung on him and he ran off aobut 110 yds. OK So your asking what does this have to do with anything? After I settled down from the excitement and took a minute to Appreciate my day outdoors and my fortune. I began to really give this deer a once over and noticed a funny mark on his neck. Upon further inspection he had a clean pass through of a 3 bladed broad head right through the middle of his neck from someone else. I mean within the last couple days, no blood, but it had not scap'd over. You would have never know seeing him out the feild chasing Doe's. It was just amazing to me to have seen this deer not 10 minutes earlier out there like nothing was wrong. All the while he had a big hole right through the middle of his neck. I can't explain no blood on your arrow, unless one blade may have sliced his neck and then when it buried in the dirt and you pulled it out and didn't find blood. Maybe it was just not deep enough to major blood, but enough to slice his esophagos. Just a thought. They are amazing animals.