Your own arrow can't hurt you when shot straight up in the air and fallen at you.
What I expected to happen was:
For your own arrow to hurt you.
What actually happened was:
It just bounces on you and falls to the ground.
Steps to Reproduce:
1. Aim the bow straight up
2. Lightly charge the bow and let go
3. Let the arrow hit you.
4. You won't get hurt.
The attachments show the arrow bouncing instead of hurting me.