Guessing he was right underneath you (or close to it) when you shot?
If you go down through a lung at that angle, it can cut through more tissue than if you hit them ground level broadside, depending on the shot of course. Also surprised he made it 80 yards before his blood pressure drop blacked him out. With a hole in the bottom like a drain, bet that blood was gushing like a race horse pees.
Yup right underneath me. it hit a lot let lung than I would expect but its because of the angle the blades hit to im thinking... lol as far as blood it rained the day before and everything was bad wet... still walked right beside his trail with no problem