One of the things a lot of beginners do not realize is the reason for needing pass a through: an arrow kills by massive hemorrhage this takes time during that time an animal runs so you need a blood trail to follow it. There are a few exceptions such as a brain or spine hit but these are chancy and not normally aimed for. A lot of bow type hunting is done from a tree stand which makes the arrow high on the entrance and low on the exit side the low side allows the blood to flow out much sooner under most circumstances.