For what it's worth, I have been involved in bowhunting now for quite a while. I also learned knapping, wherein I can flake blades and arrow points from glass/stone/etc. Interesting thing is that an obsidian blade, when well made, is significantly sharper than steel. Microscopically, the sharpest steel edge is still a saw-blade. Obsidian, and glass, are smooth-edged blades, down to close to the molecular level. Surgical scalpels, made of obsidian, leave next to no scar because they actually cut rather than tear at the microscopic level. Some knappers have custom-made the scalpels for their surgeries with excellent results.