I honestly think, and I'm not being a jerkwad here, if you have a double lung on a deer and it lives that long and runs that far, your buddy should look into better broadheads or something. Its not like a good passthrough both lungs with a good broadhead SHOULD collapse both lungs and do enough damage to kill the thing well before thirty minutes. No air equals unconcious and death in short order. If yo uare high and to the back, you can pass through a pocket of nothing and get good blood only to have thedeer or elk heal up for you, but a double lung should equal instant death. I'd be curious as to what broadhead he is using....expandables that didn't open.....IDK something is totally wrong with that scenario.