I'm thinking we are all in agreement here more than we realize. And although arrows kill by creating a lot of bleeding and have very little shock (maybe enough for a bunny); there is still a certain amount of KE needed to get the arrow in the animal deep enough for the broadhead to do its work. A 15 lb. kid's bow isn't going to be able to drive a Carbon Expressarrow,sporting the latest Slick Trick broadhead, deep enough into a big game animal to facilitate a humane harvest. I'm sure that is why Colorado (and many other states) has a minimum (35lb.) pull weight for archery big game.