Not saying this is what happened, but bouncing a bullet into the target causes me to present this hunting story. I was hunting timber wolves with a friend in the early 80s. We went in different directions across a large frozen lake. At the end of the half-days hunt, we met and he told me about a wolf he had hit but didn't recover. Turns out a wolf cut across this 2 1/2 mile wide lake. It was out there on the ice a very long ways from him. He didn't know how many yards really, since he wasn't used to shooting that far. Was shooting a .300 Win Mag - factory rounds of some sort. When I walked to the edge of the lake and saw how far away the wolf tracks were from the shooting position where the wolf ran into the woods, I knew the distance was on the order of 700-800 yards, and this friend had never shot more than about 400 yards ever. There were no laser range finders back then.
So I back tracked the wolf out onto the lake ice until I could see where the wolf was initially hit, and fell at the shot. From there I walked back in a straight line to where my friend was when he had taken the shot, so as to pace off the distance. About 70 yards from where the bullet hit the wolf, I found a bullet groove mark in the ice. About 100 yards farther, I found another bullet groove mark in the ice. Turns out my friend hit this wolf on the second ricochet off the lake ice. Which was about all that really made any sense after he told me how high he held over the wolf for an aiming point. Unluckiest wolf in the world! The wolf was hurt pretty bad, but we tracked him a long ways the following day and he seemed like he was going to make it. We think the bullet hit back in the rear ham, from the evidence where the wolf had bedded down on snow up in the woods.