Had a buddy call me 2 years ago, the night before thanksgiving. He had stuck a cow and wanted to get up in the morning and go look for her. He said he shot her about 1/2 hour before dark and when he called me it had been dark for about 2 hours. I told him that we should just go and look that night because if she was mortally wounded she would be dead long before we get there. He insisted that we get up on Thanksgiving and go. When we got there we literally on walked 50 yards from where he last marked blood and there she laid. IMO giving the animal overnight is risking the chance of rotten meat. If the animal is gonna expire and is mortally hit, just give it a couple hours to be safe and then go get it. I dont know how but his cow was still good but still to risky for me to pull that maneuver.