I was out of town for a while. It is easy to see why an 80# bow will not pas through a deer's lung area. I hunt land open to the public and always did. I see "hunters" sitting in one fence row and shooting at deer 60-70 yards across the field. That is the only reason to shoot an 80# bow when hunting deer, more range. I don't doubt that he is shooting the lightest arrows and heads he can find to get more speed. I know two people (very well) that shot deer in the shoulder (accidentally) with compounds over 55#. The arrows bounced off the shoulders. The arrows were very light and the heads were of the chisel point style. I screwed up and hit one in the shoulder with a 43# bow and it broke out a piece of bone and penetrated the heart, actually coming out of the other side of the heart. I use Zwickey or Bear 2 blade heads. His arrows may be under spined for the weight of the bow. That absorbs a lot of energy until the arrow clears the bow. The main reason he won't get a pass through is probably that he knows nothing about deer anatomy and is hitting them really high or too far forward. The quickest way to slow down an arrow in a deer is to hit solid meat. I have been hunting with a bow for over 40 years, and it is obvious that you are a target shooter and not a hunter when it comes to recurves and longbows. There is a big difference.