Im just joining this thread after reading and seeing it all, I think the arrow went just under the spine in a viod area above the intestines and right through the backstraps. There is no way that arrow went over the spine and curved around and made that exit hole. In looking at the diagram the guts don't actually go all the way up to the spine like it shows. There is some meat in there between the guts and the spine and that is what it looks like it went through. What I can't believe is that it didn't hit the main artery running down that area of the deer. The deer is going to live, if it was infected that deer would be laying next to a rive in some thick sh$t with a fever like no other, and if it hit or even nicked some guts he would be infected by now and not thinking about food and walking around. He looks a little sore when he walks but I have seen trail came picks on this site before of people hitting deer in that area (a little up farther up twards the vitals) but they had them with there wounds on a trail came pick a couple of weeks later doing just fine.

You made the right desicion!....It would have been another story if he came by you all hunched up and struggling. He's walking around and thinking about food and he isn't infected so he will live.