I'm with both of you on this- If you READ the material, its all about the bullet..but the photos with vitals shown- for those of us who haven't been yet are ideal - just like this one, for establishing in your mind where you want to put the arrow through TO...in other words, pick the spot you want the arrow to EXIT the body, depending on your angle of entry.
Especially if you are like me, a visual mathematician, I NEED to SEE what is being talked about before its crystal clear. Buy the little one and carry it is my recommendation.