I just helped someone hang two deer in his garage he shot them both with gun, on private land, in the process while they were hunting 22 deer walk by the tree stand they're using, both of the deer were gut shot, one deer had a gaping hole in its side (not where they cut it to clean it) but alongside behind its rib cage, was about 15 inches long, almost from the hip to the first back rib, guts were hanging out of it, it was enough to cure me from ever hunting deer with a gun again.
He gave me the excuse the deer spun around on him. I think the problem was shot were 100 -150 yards.
They call it hunting !
I think your idea of helping him get his deer out of the woods and process it, show him that you still joy hunting, and by the way, in our state I can take a deer with a bow in rifle season, so take your bow along, who know, you may get one, and he may not, may start him thinking.
Carl