If he knew he got guts then chances are the deer was going to live quite a few hours, 6+, but it will die. Why take up the trail after only 40 minutes? You knew it was a gut shot, you know gutshots can and many times do live a quite a while, therefore the meat wont be spoiling in 40 minutes because she isnt dead yet!!!!!

You never even gave yourself a chance to find this deer because you pushed her so quickly and now you probably have gauranteed her meat will spoil because she is long gone, suffering, and leaving no blood behind.[:@][:@][:@]